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, 2022
Dec. 31, 2021
Investments    
Amortized Cost    
One year or less $ 1,543 $ 1,390
One year through five years 6,519 6,212
Five years through ten years 3,903 3,647
Greater than ten years 93 73
Asset-backed securities 3,166 3,028
Amortized Cost 15,224 14,350
Fair Value    
One year or less 1,540 1,396
One year through five years 6,327 6,294
Five years through ten years 3,665 3,681
Greater than ten years 91 78
Asset-backed securities 3,051 3,034
Fair Value 14,674 14,483
Restricted Deposits    
Amortized Cost    
One year or less 611 368
One year through five years 400 460
Five years through ten years 238 244
Greater than ten years 0 0
Asset-backed securities 0 0
Amortized Cost 1,249 1,072
Fair Value    
One year or less 609 368
One year through five years 382 457
Five years through ten years 219 243
Greater than ten years 0 0
Asset-backed securities 0 0
Fair Value $ 1,210 $ 1,068