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Investment Information - Maturity profile of available for sale securities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Estimated Fair Value
Estimated fair value	$ 35,051	$ 29,819
Amortized Cost
Amortized cost	34,953	30,354
Fixed maturities available for sale, at fair value
Estimated Fair Value
Due in one year or less	370	438
Due after one year through five years	17,053	15,364
Due after five years through 10 years	6,893	5,811
Due after 10 years	619	385
Single maturity date	24,935	21,998
Estimated fair value	32,426	27,035
Amortized Cost
Due in one year or less	366	451
Due after one year through five years	16,989	15,590
Due after five years through 10 years	6,877	6,039
Due after 10 years	621	401
Single maturity date	24,853	22,481
Amortized cost	32,329	27,570
Mortgage backed securities
Estimated Fair Value
Securities without single maturity date	2,705	1,079
Estimated fair value	2,705	1,079
Amortized Cost
Securities without single maturity date	2,692	1,104
Amortized cost	2,692	1,104
Commercial mortgage backed securities
Estimated Fair Value
Securities without single maturity date	1,212	1,058
Estimated fair value	1,212	1,058
Amortized Cost
Securities without single maturity date	1,207	1,064
Amortized cost	1,207	1,064
Asset backed securities
Estimated Fair Value
Securities without single maturity date	3,574	2,900
Estimated fair value	3,574	2,900
Amortized Cost
Securities without single maturity date	3,577	2,921
Amortized cost	$ 3,577	$ 2,921

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