Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Amortized Cost
Less than one year	$ 850
One year through five years	11,487
After five years through ten years	5,706
Greater than ten years	3,097
Amortized Cost	28,593	$ 28,600
Fair Value
Less than one year	852
One year through five years	11,534
After five years through ten years	5,685
Greater than ten years	2,900
Fair Value	28,391	28,718
Residential mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	1,090
Amortized Cost	1,090	1,065
Fair Value
Debt securities, maturity, without single maturity date	1,069
Fair Value	1,069	1,050
Commercial mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	1,889
Amortized Cost	1,889	1,974
Fair Value
Debt securities, maturity, without single maturity date	1,875
Fair Value	1,875	1,979
Other asset-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	4,474
Amortized Cost	4,474	4,921
Fair Value
Debt securities, maturity, without single maturity date	4,476
Fair Value	$ 4,476	$ 4,944

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