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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Estimated Fair Value
Due in one year or less	$ 493	$ 438
Due after one year through five years	16,026	15,364
Due after five years through 10 years	5,981	5,811
Due after 10 years	525	385
Single maturity date	23,025	21,998
Estimated Fair Value	31,275	29,819
Amortized Cost
Due in one year or less	507	451
Due after one year through five years	16,088	15,590
Due after five years through 10 years	6,106	6,039
Due after 10 years	526	401
Single maturity date	23,227	22,481
Cost or Amortized Cost	31,517	30,354
Fixed maturities
Estimated Fair Value
Estimated Fair Value	28,798	27,035
Amortized Cost
Cost or Amortized Cost	29,041	27,570
Residential mortgage backed securities
Estimated Fair Value
Securities without single maturity date	1,755	1,079
Estimated Fair Value	1,755	1,079
Amortized Cost
Securities without single maturity date	1,765	1,104
Cost or Amortized Cost	1,765	1,104
Commercial mortgage backed securities
Estimated Fair Value
Securities without single maturity date	931	1,058
Estimated Fair Value	931	1,058
Amortized Cost
Securities without single maturity date	935	1,064
Cost or Amortized Cost	935	1,064
Asset backed securities
Estimated Fair Value
Securities without single maturity date	3,087	2,900
Estimated Fair Value	3,087	2,900
Amortized Cost
Securities without single maturity date	3,114	2,921
Cost or Amortized Cost	$ 3,114	$ 2,921

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