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, 2020
Dec. 31, 2019
Debt Securities    
Gross Unrealized Gains $ 404 $ 200
Gross Unrealized Losses (58) (9)
Equity securities 561 0
Private equity investments 778 664
Life insurance contracts 146 148
Total, Amortized Cost 12,493 9,047
Total, Fair Value 12,839 9,238
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Debt Securities    
Amortized Cost 975 211
Gross Unrealized Gains 6 1
Gross Unrealized Losses 0 0
Fair Value 981 212
Corporate securities    
Debt Securities    
Amortized Cost 4,841 3,629
Gross Unrealized Gains 222 108
Gross Unrealized Losses (32) (4)
Fair Value 5,031 3,733
Restricted certificates of deposit    
Debt Securities    
Amortized Cost 104 482
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 104 482
Restricted cash equivalents    
Debt Securities    
Amortized Cost 157 8
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 157 8
Short-term time deposits    
Debt Securities    
Amortized Cost 56 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 56 0
Municipal securities    
Debt Securities    
Amortized Cost 2,429 2,320
Gross Unrealized Gains 111 69
Gross Unrealized Losses (5) (1)
Fair Value 2,535 2,388
Asset-backed securities    
Debt Securities    
Amortized Cost 974 741
Gross Unrealized Gains 10 5
Gross Unrealized Losses (13) (2)
Fair Value 971 744
Residential mortgage-backed securities    
Debt Securities    
Amortized Cost 888 464
Gross Unrealized Gains 32 8
Gross Unrealized Losses 0 (1)
Fair Value 920 471
Commercial mortgage-backed securities    
Debt Securities    
Amortized Cost 584 380
Gross Unrealized Gains 23 9
Gross Unrealized Losses (8) (1)
Fair Value $ 599 $ 388