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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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