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Investments - Variable Interest Entities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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 3,200 3,000  
Investment Program, Proportional Amortization Method, Applied, Amortization Expense 2 1 $ 0
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense 8 1 $ 0
Other Assets 1,981 1,754  
Investment Program, Proportional Amortization Method, Elected, Commitment 267 180  
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized 86    
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale 1    
Variable Interest Entity, Not Primary Beneficiary [Member]      
Schedule of Investments [Line Items]      
Other Assets 51 20  
Collateralized Loan Obligations [Member] | Securities available-for-sale and other      
Schedule of Investments [Line Items]      
Variable Interest Entity, Reporting Entity Involvement, Commitments 426    
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds 24    
Collateralized Loan Obligations [Member] | Fair Value Option, Other Eligible Items      
Schedule of Investments [Line Items]      
Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds 50    
Variable Interest Entity, Not Primary Beneficiary [Member]      
Schedule of Investments [Line Items]      
Variable Interest Entity, Reporting Entity Involvement, Commitments $ 2,000 $ 1,700