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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Estimated Fair Value |  |
Due in one year or less | $ 480 | $ 438
Due after one year through five years | 17,031 | 15,364
Due after five years through 10 years | 6,123 | 5,811
Due after 10 years | 704 | 385
Single maturity date | 24,338 | 21,998
Estimated Fair Value | 33,120 | 29,819
Amortized Cost |  |
Due in one year or less | 490 | 451
Due after one year through five years | 16,947 | 15,590
Due after five years through 10 years | 6,168 | 6,039
Due after 10 years | 701 | 401
Single maturity date | 24,306 | 22,481
Cost or Amortized Cost | 33,098 | 30,354
Fixed maturities |  |
Estimated Fair Value |  |
Estimated Fair Value | 30,332 | 27,035
Amortized Cost |  |
Cost or Amortized Cost | 30,312 | 27,570
Residential mortgage backed securities |  |
Estimated Fair Value |  |
Securities without single maturity date | 2,386 | 1,079
Estimated Fair Value | 2,386 | 1,079
Amortized Cost |  |
Securities without single maturity date | 2,386 | 1,104
Cost or Amortized Cost | 2,386 | 1,104
Commercial mortgage backed securities |  |
Estimated Fair Value |  |
Securities without single maturity date | 838 | 1,058
Estimated Fair Value | 838 | 1,058
Amortized Cost |  |
Securities without single maturity date | 838 | 1,064
Cost or Amortized Cost | 838 | 1,064
Asset backed securities |  |
Estimated Fair Value |  |
Securities without single maturity date | 2,770 | 2,900
Estimated Fair Value | 2,770 | 2,900
Amortized Cost |  |
Securities without single maturity date | 2,782 | 2,921
Cost or Amortized Cost | $ 2,782 | $ 2,921

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