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
Jun. 30, 2022
Dec. 31, 2021
Investments    
Amortized Cost    
One year or less $ 1,646 $ 1,390
One year through five years 6,713 6,212
Five years through ten years 3,941 3,647
Greater than ten years 99 73
Asset-backed securities 3,238 3,028
Amortized Cost 15,637 14,350
Fair Value    
One year or less 1,632 1,396
One year through five years 6,374 6,294
Five years through ten years 3,521 3,681
Greater than ten years 93 78
Asset-backed securities 3,039 3,034
Fair Value 14,659 14,483
Restricted Deposits    
Amortized Cost    
One year or less 490 368
One year through five years 543 460
Five years through ten years 243 244
Greater than ten years 1 0
Asset-backed securities 0 0
Amortized Cost 1,277 1,072
Fair Value    
One year or less 488 368
One year through five years 518 457
Five years through ten years 218 243
Greater than ten years 1 0
Asset-backed securities 0 0
Fair Value $ 1,225 $ 1,068