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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Less than one year	$ 835
One year through five years	11,365
After five years through ten years	4,698
Greater than ten years	2,826
Amortized Cost	27,705	$ 26,562
Fair Value
Less than one year	838
One year through five years	11,512
After five years through ten years	4,783
Greater than ten years	2,712
Fair Value	27,835	26,033
Residential mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	963
Amortized Cost	963	792
Fair Value
Debt securities, maturity, without single maturity date	941
Fair Value	941	740
Commercial mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	1,935
Amortized Cost	1,935	1,731
Fair Value
Debt securities, maturity, without single maturity date	1,935
Fair Value	1,935	1,673
Other asset-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	5,083
Amortized Cost	5,083	4,834
Fair Value
Debt securities, maturity, without single maturity date	5,114
Fair Value	$ 5,114	$ 4,862

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