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Investments (Contractual maturity) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Investments [Abstract] |  |
Due in one year or less, cost or amortized cost | $ 1,533 | $ 1,603
Due after one year through five years, cost or amortized cost | 10,206 | 10,637
Due after five years through ten years, cost or amortized cost | 14,040 | 13,294
Due after ten years, cost or amortized cost | 15,143 | 14,411
Cost or Amortized Cost | 40,922 | 39,945
Due in one year or less, estimated fair value | 1,546 | 1,624
Due after one year through five years, estimated fair value | 10,337 | 11,229
Due after five years through ten years, estimated fair value | 14,032 | 14,338
Due after ten years, estimated fair value | 16,024 | 17,182
Estimated Fair Value | $ 41,939 | $ 44,373

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