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
Mar. 31, 2021
Dec. 31, 2020
Debt Securities    
Gross Unrealized Gains $ 336 $ 465
Gross Unrealized Losses (99) (18)
Equity securities 319 318
Private equity investments 896 838
Life insurance contracts 172 168
Total, Amortized Cost 15,783 15,046
Total, Fair Value 16,020 15,493
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Debt Securities    
Amortized Cost 515 907
Gross Unrealized Gains 2 4
Gross Unrealized Losses 0 0
Fair Value 517 911
Corporate securities    
Debt Securities    
Amortized Cost 6,944 6,560
Gross Unrealized Gains 182 262
Gross Unrealized Losses (64) (8)
Fair Value 7,062 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 677 157
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 677 157
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 3,118 2,970
Gross Unrealized Gains 101 129
Gross Unrealized Losses (14) (2)
Fair Value 3,205 3,097
Asset-backed securities    
Debt Securities    
Amortized Cost 1,197 1,154
Gross Unrealized Gains 12 13
Gross Unrealized Losses (2) (3)
Fair Value 1,207 1,164
Residential mortgage-backed securities    
Debt Securities    
Amortized Cost 1,066 1,068
Gross Unrealized Gains 20 27
Gross Unrealized Losses (8) 0
Fair Value 1,078 1,095
Commercial mortgage-backed securities    
Debt Securities    
Amortized Cost 793 748
Gross Unrealized Gains 19 30
Gross Unrealized Losses (11) (5)
Fair Value $ 801 $ 773