Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Amortized Cost
Less than one year	$ 819
One year through five years	10,469
After five years through ten years	4,827
Greater than ten years	3,127
Amortized Cost	26,433	$ 22,282
Fair Value
Less than one year	816
One year through five years	10,529
After five years through ten years	4,890
Greater than ten years	3,064
Fair Value	26,490	21,713
Residential mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	815
Amortized Cost	815	862
Fair Value
Debt securities, maturity, without single maturity date	795
Fair Value	795	810
Commercial mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	1,609
Amortized Cost	1,609	1,066
Fair Value
Debt securities, maturity, without single maturity date	1,583
Fair Value	1,583	975
Other asset-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	4,767
Amortized Cost	4,767	3,294
Fair Value
Debt securities, maturity, without single maturity date	4,813
Fair Value	$ 4,813	$ 3,302

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