Quarterly report pursuant to Section 13 or 15(d)

Short-term and Long-term Investments, Restricted Deposits - By Investment Type (Details)

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Short-term and Long-term Investments, Restricted Deposits - By Investment Type (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Securities    
Gross Unrealized Gains $ 365 $ 465
Gross Unrealized Losses (45) (18)
Equity securities 317 318
Private equity investments 906 838
Life insurance contracts 181 168
Total, Amortized Cost 15,830 15,046
Total, Fair Value 16,150 15,493
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Debt Securities    
Amortized Cost 604 907
Gross Unrealized Gains 2 4
Gross Unrealized Losses (1) 0
Fair Value 605 911
Corporate securities    
Debt Securities    
Amortized Cost 7,242 6,560
Gross Unrealized Gains 203 262
Gross Unrealized Losses (28) (8)
Fair Value 7,417 6,814
Restricted certificates of deposit    
Debt Securities    
Amortized Cost 4 105
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 4 105
Restricted cash equivalents    
Debt Securities    
Amortized Cost 177 157
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 177 157
Short-term time deposits    
Debt Securities    
Amortized Cost 82 53
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 82 53
Municipal securities    
Debt Securities    
Amortized Cost 3,348 2,970
Gross Unrealized Gains 112 129
Gross Unrealized Losses (5) (2)
Fair Value 3,455 3,097
Asset-backed securities    
Debt Securities    
Amortized Cost 1,175 1,154
Gross Unrealized Gains 10 13
Gross Unrealized Losses (1) (3)
Fair Value 1,184 1,164
Residential mortgage-backed securities    
Debt Securities    
Amortized Cost 985 1,068
Gross Unrealized Gains 16 27
Gross Unrealized Losses (5) 0
Fair Value 996 1,095
Commercial mortgage-backed securities    
Debt Securities    
Amortized Cost 809 748
Gross Unrealized Gains 22 30
Gross Unrealized Losses (5) (5)
Fair Value $ 826 $ 773