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Investments (Contractual maturity) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investments [Abstract] |  |
Due in one year or less, cost or amortized cost | $ 1,009 | $ 1,012
Due after one year through five years, cost or amortized cost | 10,486 | 9,880
Due after five years through ten years, cost or amortized cost | 13,763 | 13,788
Due after ten years, cost or amortized cost | 16,388 | 16,352
Cost or Amortized Cost | 41,646 | 41,032
Due in one year or less, estimated fair value | 989 | 1,001
Due after one year through five years, estimated fair value | 10,035 | 9,399
Due after five years through ten years, estimated fair value | 12,702 | 12,453
Due after ten years, estimated fair value | 15,367 | 14,774
Estimated Fair Value | $ 39,093 | $ 37,627

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