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Investments (Contractual maturity) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Investments [Abstract]    
Due in one year or less, cost or amortized cost $ 1,585 $ 1,121
Due after one year through five years, cost or amortized cost 11,948 11,563
Due after five years through ten years, cost or amortized cost 13,333 13,359
Due after ten years, cost or amortized cost 16,685 16,371
Cost or Amortized Cost 43,551 42,414
Due in one year or less, estimated fair value 1,565 1,091
Due after one year through five years, estimated fair value 11,800 11,180
Due after five years through ten years, estimated fair value 12,959 12,573
Due after ten years, estimated fair value 16,255 15,581
Estimated Fair Value $ 42,579 $ 40,425