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Investments - Variable Interest Entities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Schedule of Investments [Line Items]      
Variable Interest Entity, Primary Beneficiary, Maximum Loss Exposure, Amount $ 0   $ 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 3,400   3,200
Investment Program, Proportional Amortization Method, Applied, Amortization Expense 4 $ 1  
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense 6 $ 2  
Other Assets 2,141   1,981
Investment Program, Proportional Amortization Method, Elected, Commitment 249   267
Variable Interest Entity, Not Primary Beneficiary [Member]      
Schedule of Investments [Line Items]      
Other Assets 65   51
Variable Interest Entity, Not Primary Beneficiary [Member]      
Schedule of Investments [Line Items]      
Variable Interest Entity, Reporting Entity Involvement, Commitments $ 1,900   $ 2,000