Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Less than one year	$ 1,262
One year through five years	8,032
After five years through ten years	4,588
Greater than ten years	3,915
Amortized Cost	23,308	$ 22,282
Fair Value
Less than one year	1,245
One year through five years	7,836
After five years through ten years	4,463
Greater than ten years	3,703
Total	22,626	21,713
Residential mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	857
Amortized Cost	857	862
Fair Value
Debt securities, maturity, without single maturity date	800
Total	800	810
Commercial mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	1,121
Amortized Cost	1,121	1,066
Fair Value
Debt securities, maturity, without single maturity date	1,036
Total	1,036	975
Other asset-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	3,533
Amortized Cost	3,533	3,294
Fair Value
Debt securities, maturity, without single maturity date	3,543
Total	$ 3,543	$ 3,302

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