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Investments - Variable Interest Entities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Schedule of Investments [Line Items]          
Variable Interest Entity, Primary Beneficiary, Maximum Loss Exposure, Amount $ 0   $ 0   $ 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 3,800   3,800   3,200
Investment Program, Proportional Amortization Method, Applied, Amortization Expense 4 $ 1 12 $ 3  
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense 6 $ 3 19 $ 8  
Other Assets 2,438   2,438   1,981
Investment Program, Proportional Amortization Method, Elected, Commitment 209   209   267
Variable Interest Entity, Not Primary Beneficiary [Member]          
Schedule of Investments [Line Items]          
Other Assets 97   97   51
Variable Interest Entity, Not Primary Beneficiary [Member]          
Schedule of Investments [Line Items]          
Variable Interest Entity, Reporting Entity Involvement, Commitments $ 2,000   $ 2,000   $ 2,000