| Assets and Liabilities, Based Upon Observable or Unobservable Inputs, Level Input Definitions |
Assets and liabilities recorded at fair value in the Consolidated Balance Sheets are categorized based upon observable or unobservable inputs used to estimate fair value. Level inputs are as follows:
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| Level Input: |
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Input Definition: |
| Level I |
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Inputs are unadjusted, quoted prices for identical assets or liabilities in active markets at the measurement date. |
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| Level II |
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Inputs other than quoted prices included in Level I that are observable for the asset or liability through corroboration with market data at the measurement date. |
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| Level III |
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Unobservable inputs that reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. |
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| Fair Value Measurements by Level for Assets and Liabilities Measured at Fair Value on a Recurring Basis |
The following table summarizes fair value measurements by level at June 30, 2021, for assets and liabilities measured at fair value on a recurring basis ($ in millions):
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Level I |
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Level II |
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Level III |
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Total |
| Assets |
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| Cash and cash equivalents |
$ |
11,018 |
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$ |
— |
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$ |
— |
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$ |
11,018 |
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| Investments: |
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U.S. Treasury securities and obligations of U.S. government corporations and agencies |
$ |
136 |
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$ |
— |
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$ |
— |
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$ |
136 |
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| Corporate securities |
— |
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7,387 |
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— |
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7,387 |
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| Municipal securities |
— |
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3,023 |
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— |
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3,023 |
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| Short-term time deposits |
— |
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82 |
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— |
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82 |
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| Asset-backed securities |
— |
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1,184 |
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— |
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1,184 |
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| Residential mortgage-backed securities |
— |
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996 |
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— |
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|
996 |
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| Commercial mortgage-backed securities |
— |
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826 |
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— |
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|
826 |
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| Equity securities |
315 |
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2 |
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— |
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|
317 |
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| Total investments |
$ |
451 |
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$ |
13,500 |
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$ |
— |
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$ |
13,951 |
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| Restricted deposits: |
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| Cash and cash equivalents |
$ |
177 |
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$ |
— |
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$ |
— |
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$ |
177 |
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| Certificates of deposit |
— |
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4 |
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— |
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4 |
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| Corporate securities |
— |
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30 |
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— |
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30 |
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Municipal securities |
— |
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432 |
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— |
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432 |
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U.S. Treasury securities and obligations of U.S. government corporations and agencies |
469 |
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— |
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— |
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469 |
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| Total restricted deposits |
$ |
646 |
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$ |
466 |
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$ |
— |
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$ |
1,112 |
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| Total assets at fair value |
$ |
12,115 |
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$ |
13,966 |
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$ |
— |
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$ |
26,081 |
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The following table summarizes fair value measurements by level at December 31, 2020, for assets and liabilities measured at fair value on a recurring basis ($ in millions):
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Level I |
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Level II |
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Level III |
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Total |
| Assets |
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| Cash and cash equivalents |
$ |
10,800 |
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$ |
— |
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$ |
— |
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$ |
10,800 |
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| Investments: |
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U.S. Treasury securities and obligations of U.S. government corporations and agencies |
$ |
165 |
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$ |
— |
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$ |
— |
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$ |
165 |
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| Corporate securities |
— |
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6,789 |
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— |
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6,789 |
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| Municipal securities |
— |
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3,070 |
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— |
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3,070 |
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| Short-term time deposits |
— |
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53 |
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— |
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53 |
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| Asset backed securities |
— |
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1,164 |
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— |
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1,164 |
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| Residential mortgage backed securities |
— |
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1,095 |
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— |
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1,095 |
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| Commercial mortgage backed securities |
— |
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773 |
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— |
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|
773 |
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| Equity securities |
316 |
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2 |
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— |
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318 |
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| Total investments |
$ |
481 |
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$ |
12,946 |
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$ |
— |
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$ |
13,427 |
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| Restricted deposits: |
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| Cash and cash equivalents |
$ |
157 |
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$ |
— |
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$ |
— |
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$ |
157 |
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| Certificates of deposit |
— |
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105 |
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— |
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105 |
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| Corporate securities |
— |
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25 |
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— |
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25 |
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Municipal securities |
— |
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27 |
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— |
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27 |
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U.S. Treasury securities and obligations of U.S. government corporations and agencies |
746 |
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— |
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— |
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746 |
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| Total restricted deposits |
$ |
903 |
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$ |
157 |
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$ |
— |
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$ |
1,060 |
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| Total assets at fair value |
$ |
12,184 |
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$ |
13,103 |
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$ |
— |
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$ |
25,287 |
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