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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Less than one year	$ 1,244
One year through five years	7,563
After five years through ten years	4,302
Greater than ten years	3,951
Net Amortized Cost	22,282	$ 22,063
Fair Value
Less than one year	1,230
One year through five years	7,390
After five years through ten years	4,204
Greater than ten years	3,802
Total	21,713	20,280
Residential mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	862
Net Amortized Cost	862	845
Fair Value
Debt securities, maturity, without single maturity date	810
Total	810	757
Commercial mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	1,066
Net Amortized Cost	1,066	1,172
Fair Value
Debt securities, maturity, without single maturity date	975
Total	975	1,018
Other asset-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	3,294
Net Amortized Cost	3,294	2,940
Fair Value
Debt securities, maturity, without single maturity date	3,302
Total	$ 3,302	$ 2,810

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