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Investments - Investments - VIEs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
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 3,100   3,100   3,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization 1 $ 0 2 $ 1  
Affordable Housing Tax Credits and Other Tax Benefits, Amount 3 $ 1 5 $ 1  
Other Assets 2,183   2,183   1,754
Qualified Affordable Housing Project Investments, Commitment 215   215   180
Variable Interest Entity, Not Primary Beneficiary [Member]          
Schedule of Investments [Line Items]          
Other Assets 23   23   20
Variable Interest Entity, Not Primary Beneficiary [Member]          
Schedule of Investments [Line Items]          
Variable Interest Entity, Reporting Entity Involvement, Commitments $ 1,800   $ 1,800   $ 1,700