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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Estimated Fair Value
Due in one year or less	$ 527	$ 438
Due after one year through five years	16,764	15,364
Due after five years through 10 years	6,808	5,811
Due after 10 years	645	385
Single maturity date	24,744	21,998
Estimated Fair Value	34,259	29,819
Amortized Cost
Due in one year or less	525	451
Due after one year through five years	16,710	15,590
Due after five years through 10 years	6,792	6,039
Due after 10 years	639	401
Single maturity date	24,666	22,481
Cost or Amortized Cost	34,171	30,354
Fixed maturities
Estimated Fair Value
Estimated Fair Value	31,908	27,035
Amortized Cost
Cost or Amortized Cost	31,821	27,570
Residential mortgage backed securities
Estimated Fair Value
Securities without single maturity date	2,766	1,079
Estimated Fair Value	2,766	1,079
Amortized Cost
Securities without single maturity date	2,758	1,104
Cost or Amortized Cost	2,758	1,104
Commercial mortgage backed securities
Estimated Fair Value
Securities without single maturity date	1,249	1,058
Estimated Fair Value	1,249	1,058
Amortized Cost
Securities without single maturity date	1,245	1,064
Cost or Amortized Cost	1,245	1,064
Asset backed securities
Estimated Fair Value
Securities without single maturity date	3,149	2,900
Estimated Fair Value	3,149	2,900
Amortized Cost
Securities without single maturity date	3,152	2,921
Cost or Amortized Cost	$ 3,152	$ 2,921

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