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Investments - Investments - VIEs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 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 3,200   3,200   3,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization 1 $ 0 3 $ 1  
Affordable Housing Tax Credits and Other Tax Benefits, Amount 3 $ 1 8 $ 1  
Other Assets 2,258   2,258   1,754
Qualified Affordable Housing Project Investments, Commitment 240   240   180
Variable Interest Entity, Not Primary Beneficiary [Member]          
Schedule of Investments [Line Items]          
Other Assets 38   38   20
Variable Interest Entity, Not Primary Beneficiary [Member]          
Schedule of Investments [Line Items]          
Variable Interest Entity, Reporting Entity Involvement, Commitments $ 2,000   $ 2,000   $ 1,700