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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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