Quarterly report pursuant to Section 13 or 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
Mar. 31, 2021
Dec. 31, 2020
Investments    
Amortized Cost    
One year or less $ 1,488 $ 1,407
One year through five years 5,082 4,748
Five years through ten years 3,589 3,460
Greater than ten years 70 81
Asset-backed securities 3,056 2,970
Amortized Cost 13,285 12,666
Fair Value    
One year or less 1,497 1,414
One year through five years 5,227 4,937
Five years through ten years 3,637 3,639
Greater than ten years 73 87
Asset-backed securities 3,086 3,032
Fair Value 13,520 13,109
Restricted Deposits    
Amortized Cost    
One year or less 845 817
One year through five years 240 221
Five years through ten years 26 18
Greater than ten years 0 0
Asset-backed securities 0 0
Amortized Cost 1,111 1,056
Fair Value    
One year or less 846 818
One year through five years 241 223
Five years through ten years 26 19
Greater than ten years 0 0
Asset-backed securities 0 0
Fair Value $ 1,113 $ 1,060