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, 2020
Dec. 31, 2019
Debt Securities    
Gross Unrealized Gains $ 206 $ 200
Gross Unrealized Losses (189) (9)
Equity securities 685 0
Private equity investments 748 664
Life insurance contracts 130 148
Total, Amortized Cost 12,904 9,047
Total, Fair Value 12,921 9,238
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Debt Securities    
Amortized Cost 771 211
Gross Unrealized Gains 7 1
Gross Unrealized Losses 0 0
Fair Value 778 212
Corporate securities    
Debt Securities    
Amortized Cost 5,036 3,629
Gross Unrealized Gains 76 108
Gross Unrealized Losses (134) (4)
Fair Value 4,978 3,733
Restricted certificates of deposit    
Debt Securities    
Amortized Cost 153 482
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 153 482
Restricted cash equivalents    
Debt Securities    
Amortized Cost 149 8
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 149 8
Short-term time deposits    
Debt Securities    
Amortized Cost 84 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 84 0
Municipal securities    
Debt Securities    
Amortized Cost 2,511 2,320
Gross Unrealized Gains 77 69
Gross Unrealized Losses (4) (1)
Fair Value 2,584 2,388
Asset-backed securities    
Debt Securities    
Amortized Cost 1,050 741
Gross Unrealized Gains 4 5
Gross Unrealized Losses (36) (2)
Fair Value 1,018 744
Residential mortgage-backed securities    
Debt Securities    
Amortized Cost 997 464
Gross Unrealized Gains 32 8
Gross Unrealized Losses (2) (1)
Fair Value 1,027 471
Commercial mortgage-backed securities    
Debt Securities    
Amortized Cost 590 380
Gross Unrealized Gains 10 9
Gross Unrealized Losses (13) (1)
Fair Value $ 587 $ 388