Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Net Amortized Cost
Less than one year	$ 1,299
One year through five years	6,704
After five years through ten years	4,980
Greater than ten years	4,403
Net Amortized Cost	22,239	$ 22,174
Fair Value
Less than one year	1,288
One year through five years	6,260
After five years through ten years	4,347
Greater than ten years	3,733
Total	20,040	23,240
Residential mortgage-backed securities
Net Amortized Cost
Debt securities, maturity, without single maturity date	859
Net Amortized Cost	859	870
Fair Value
Debt securities, maturity, without single maturity date	750
Total	750	875
Commercial mortgage-backed securities
Net Amortized Cost
Debt securities, maturity, without single maturity date	1,203
Net Amortized Cost	1,203	1,278
Fair Value
Debt securities, maturity, without single maturity date	1,037
Total	1,037	1,310
Other asset-backed securities
Net Amortized Cost
Debt securities, maturity, without single maturity date	2,791
Net Amortized Cost	2,791	2,791
Fair Value
Debt securities, maturity, without single maturity date	2,625
Total	$ 2,625	$ 2,792

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