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Investments - Variable Interest Entities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 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 3,600   3,600   3,200
Investment Program, Proportional Amortization Method, Applied, Amortization Expense 4 $ 1 8 $ 2  
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense 7 $ 3 13 $ 5  
Other Assets 2,379   2,379   1,981
Investment Program, Proportional Amortization Method, Elected, Commitment 226   226   267
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding 4,800   4,800   4,800
Variable Interest Entity, Not Primary Beneficiary [Member]          
Schedule of Investments [Line Items]          
Other Assets 84   84   51
Variable Interest Entity, Not Primary Beneficiary [Member]          
Schedule of Investments [Line Items]          
Variable Interest Entity, Reporting Entity Involvement, Commitments $ 2,100   $ 2,100   $ 2,000