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Variable Interest Entities - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Accrued income and other assets $ 8,601,000,000 $ 9,223,000,000
Accrued expense and other liabilities 5,412,000,000 4,994,000,000
VIE, assets that can only be used to settle obligations 188,281,000,000 189,813,000,000
VIE, liabilities 173,644,000,000 176,359,000,000
Fair Value, Recurring    
Variable Interest Entity [Line Items]    
Other investments 63,000,000 77,000,000
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Accrued income and other assets 2,300,000,000 1,900,000,000
Accrued expense and other liabilities 1,400,000,000 957,000,000
VIE, assets that can only be used to settle obligations 1,149,000,000 1,798,000,000
Tax credit of investment   187,000,000
VIE, liabilities 1,000,000 1,000,000
Variable Interest Entity, Not Primary Beneficiary | NMTC    
Variable Interest Entity [Line Items]    
VIE, assets that can only be used to settle obligations 25,000,000 12,000,000
Variable Interest Entity, Not Primary Beneficiary | Other Unconsolidated Variable Interest Entities    
Variable Interest Entity [Line Items]    
Other investments 731,000,000  
Variable Interest Entity, Not Primary Beneficiary | Investments    
Variable Interest Entity [Line Items]    
Amortization of investment 217,000,000 190,000,000
Tax credit of investment 204,000,000  
Other tax benefits 52,000,000 45,000,000
Variable Interest Entity, Primary Beneficiary | Investments    
Variable Interest Entity [Line Items]    
VIE, liabilities 0 0
Measured at NAV | Variable Interest Entity, Not Primary Beneficiary | Fair Value, Recurring | Principal investments: Indirect    
Variable Interest Entity [Line Items]    
Other investments $ 17,000,000 $ 34,000,000