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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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