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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, 2022
Dec. 31, 2021
Investments    
Amortized Cost    
One year or less $ 2,207 $ 1,390
One year through five years 7,651 6,212
Five years through ten years 4,066 3,647
Greater than ten years 135 73
Asset-backed securities 3,522 3,028
Amortized Cost 17,581 14,350
Fair Value    
One year or less 2,179 1,396
One year through five years 7,147 6,294
Five years through ten years 3,613 3,681
Greater than ten years 129 78
Asset-backed securities 3,234 3,034
Fair Value 16,302 14,483
Restricted Deposits    
Amortized Cost    
One year or less 534 368
One year through five years 524 460
Five years through ten years 224 244
Greater than ten years 0 0
Asset-backed securities 0 0
Amortized Cost 1,282 1,072
Fair Value    
One year or less 532 368
One year through five years 490 457
Five years through ten years 195 243
Greater than ten years 0 0
Asset-backed securities 0 0
Fair Value $ 1,217 $ 1,068