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Investment Information - Maturity profile of available for sale securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Estimated Fair Value: |  |
Estimated fair value | $ 25,616 | $ 21,015
Amortized Cost: |  |
Amortized cost | 26,195 | 22,615
Fixed maturities available for sale, at fair value |  |
Estimated Fair Value: |  |
Due in one year or less | 480 | 511
Due after one year through five years | 12,924 | 11,016
Due after five years through 10 years | 5,249 | 3,984
Due after 10 years | 334 | 403
Single maturity date | 18,987 | 15,914
Estimated fair value | 23,553 | 19,683
Amortized Cost: |  |
Due in one year or less | 499 | 537
Due after one year through five years | 13,101 | 11,715
Due after five years through 10 years | 5,450 | 4,527
Due after 10 years | 374 | 480
Single maturity date | 19,424 | 17,259
Amortized cost | 24,131 | 21,282
Mortgage backed securities |  |
Estimated Fair Value: |  |
Securities without single maturity date | 1,103 | 795
Estimated fair value | 1,103 | 795
Amortized Cost: |  |
Securities without single maturity date | 1,162 | 877
Amortized cost | 1,162 | 877
Commercial mortgage backed securities |  |
Estimated Fair Value: |  |
Securities without single maturity date | 1,213 | 1,047
Estimated fair value | 1,213 | 1,047
Amortized Cost: |  |
Securities without single maturity date | 1,246 | 1,107
Amortized cost | 1,246 | 1,107
Asset backed securities |  |
Estimated Fair Value: |  |
Securities without single maturity date | 2,250 | 1,927
Estimated fair value | 2,250 | 1,927
Amortized Cost: |  |
Securities without single maturity date | 2,299 | 2,039
Amortized cost | $ 2,299 | $ 2,039

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