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, 2022
Dec. 31, 2021
Debt Securities    
Gross Unrealized Gains $ 41 $ 243
Gross Unrealized Losses (630) (114)
Equity securities 301 326
Private equity investments 626 587
Life insurance contracts 196 186
Total, Amortized Cost 17,596 16,521
Total, Fair Value 17,007 16,650
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Debt Securities    
Amortized Cost 552 642
Gross Unrealized Gains 0 0
Gross Unrealized Losses (9) (2)
Fair Value 543 640
Corporate securities    
Debt Securities    
Amortized Cost 8,752 8,145
Gross Unrealized Gains 26 130
Gross Unrealized Losses (368) (75)
Fair Value 8,410 8,200
Restricted certificates of deposit    
Debt Securities    
Amortized Cost 4 4
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 4 4
Restricted cash equivalents    
Debt Securities    
Amortized Cost 262 96
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 262 96
Short-term time deposits    
Debt Securities    
Amortized Cost 130 109
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 130 109
Municipal securities    
Debt Securities    
Amortized Cost 3,607 3,398
Gross Unrealized Gains 13 85
Gross Unrealized Losses (136) (15)
Fair Value 3,484 3,468
Asset-backed securities    
Debt Securities    
Amortized Cost 1,308 1,308
Gross Unrealized Gains 0 5
Gross Unrealized Losses (29) (5)
Fair Value 1,279 1,308
Residential mortgage-backed securities    
Debt Securities    
Amortized Cost 919 850
Gross Unrealized Gains 1 10
Gross Unrealized Losses (45) (7)
Fair Value 875 853
Commercial mortgage-backed securities    
Debt Securities    
Amortized Cost 939 870
Gross Unrealized Gains 1 13
Gross Unrealized Losses (43) (10)
Fair Value $ 897 $ 873