Annual report pursuant to Section 13 and 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
Dec. 31, 2019
Dec. 31, 2018
Debt Securities    
Gross Unrealized Gains $ 200 $ 21
Gross Unrealized Losses (9) (91)
Private equity investments 664 387
Life insurance contracts 148 128
Total, Amortized Cost 9,047 8,208
Total, Fair Value 9,238 8,138
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Debt Securities    
Amortized Cost 211 362
Gross Unrealized Gains 1 1
Gross Unrealized Losses 0 (2)
Fair Value 212 361
Corporate securities    
Debt Securities    
Amortized Cost 3,629 3,190
Gross Unrealized Gains 108 8
Gross Unrealized Losses (4) (52)
Fair Value 3,733 3,146
Restricted certificates of deposit    
Debt Securities    
Amortized Cost 482 433
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 482 433
Restricted cash equivalents    
Debt Securities    
Amortized Cost 8 8
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 8 8
Municipal securities    
Debt Securities    
Amortized Cost 2,320 2,196
Gross Unrealized Gains 69 9
Gross Unrealized Losses (1) (18)
Fair Value 2,388 2,187
Asset-backed securities    
Debt Securities    
Amortized Cost 741 686
Gross Unrealized Gains 5 1
Gross Unrealized Losses (2) (4)
Fair Value 744 683
Residential mortgage-backed securities    
Debt Securities    
Amortized Cost 464 452
Gross Unrealized Gains 8 1
Gross Unrealized Losses (1) (9)
Fair Value 471 444
Commercial mortgage- backed securities    
Debt Securities    
Amortized Cost 380 366
Gross Unrealized Gains 9 1
Gross Unrealized Losses (1) (6)
Fair Value $ 388 $ 361