Annual report pursuant to Section 13 and 15(d)

Short-term and Long-term Investments, Restricted Deposits - Contractual Maturities of Short-Term And Long-Term Investments And Restricted Deposits (Details)

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Short-term and Long-term Investments, Restricted Deposits - Contractual Maturities of Short-Term And Long-Term Investments And Restricted Deposits (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Investments    
Amortized Cost    
One year or less $ 750 $ 647
One year through five years 3,034 3,026
Five years through ten years 2,974 2,387
Greater than ten years 48 88
Asset-backed securities 1,585 1,504
Amortized Cost 8,391 7,652
Fair Value    
One year or less 752 646
One year through five years 3,106 2,998
Five years through ten years 3,069 2,362
Greater than ten years 50 89
Asset-backed securities 1,603 1,488
Fair value 8,580 7,583
Restricted Deposits    
Amortized Cost    
One year or less 550 205
One year through five years 106 351
Five years through ten years 0 0
Greater than ten years 0 0
Asset-backed securities 0 0
Amortized Cost 656 556
Fair Value    
One year or less 550 205
One year through five years 108 350
Five years through ten years 0 0
Greater than ten years 0 0
Asset-backed securities 0 0
Fair value $ 658 $ 555