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Investment Information - Maturity profile of available for sale securities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Estimated Fair Value
Due in one year or less	$ 536	$ 480
Due after one year through five years	12,998	12,924
Due after five years through 10 years	4,632	5,249
Due after 10 years	324	334
Single maturity date	18,490	18,987
Estimated Fair Value	25,770	25,616
Amortized Cost
Due in one year or less	554	499
Due after one year through five years	13,299	13,101
Due after five years through 10 years	4,860	5,450
Due after 10 years	359	374
Single maturity date	19,072	19,424
Cost or Amortized Cost	26,481	26,195
Fixed maturities
Estimated Fair Value
Estimated Fair Value	23,628	23,553
Amortized Cost
Cost or Amortized Cost	24,338	24,131
Residential mortgage backed securities
Estimated Fair Value
Securities without single maturity date	1,179	1,103
Estimated Fair Value	1,179	1,103
Amortized Cost
Securities without single maturity date	1,244	1,162
Cost or Amortized Cost	1,244	1,162
Commercial mortgage backed securities
Estimated Fair Value
Securities without single maturity date	1,197	1,213
Estimated Fair Value	1,197	1,213
Amortized Cost
Securities without single maturity date	1,226	1,246
Cost or Amortized Cost	1,226	1,246
Asset backed securities
Estimated Fair Value
Securities without single maturity date	2,762	2,250
Estimated Fair Value	2,762	2,250
Amortized Cost
Securities without single maturity date	2,796	2,299
Cost or Amortized Cost	$ 2,796	$ 2,299

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