Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost
Less than one year	$ 763
One year through five years	10,599
After five years through ten years	4,683
Greater than ten years	3,160
Amortized Cost	26,562	$ 22,282
Fair Value
Less than one year	761
One year through five years	10,510
After five years through ten years	4,578
Greater than ten years	2,909
Total	26,033	21,713
Residential mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	792
Amortized Cost	792	862
Fair Value
Debt securities, maturity, without single maturity date	740
Total	740	810
Commercial mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	1,731
Amortized Cost	1,731	1,066
Fair Value
Debt securities, maturity, without single maturity date	1,673
Total	1,673	975
Other asset-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	4,834
Amortized Cost	4,834	3,294
Fair Value
Debt securities, maturity, without single maturity date	4,862
Total	$ 4,862	$ 3,302

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