v3.26.1
Variable Interest Entities - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]      
Accrued income and other assets $ 9,100,000,000   $ 8,481,000,000
Accrued expense and other liabilities 3,801,000,000   4,286,000,000
VIE, assets that can only be used to settle obligations 188,663,000,000   184,381,000,000
VIE, liabilities 168,676,000,000   164,000,000,000
Recurring      
Variable Interest Entity [Line Items]      
Other investments 89,000,000   86,000,000
Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
VIE, assets that can only be used to settle obligations 477,000,000   508,000,000
VIE, liabilities 0   0
Variable Interest Entity, Not Primary Beneficiary | LIHTC      
Variable Interest Entity [Line Items]      
Accrued income and other assets 2,400,000,000   2,400,000,000
Accrued expense and other liabilities 1,100,000,000   1,100,000,000
VIE, assets that can only be used to settle obligations 9,635,000,000   11,212,000,000
VIE, liabilities 4,252,000,000   5,026,000,000
Variable Interest Entity, Not Primary Beneficiary | NMTC      
Variable Interest Entity [Line Items]      
Accrued income and other assets 17,000,000   18,000,000
Variable Interest Entity, Not Primary Beneficiary | Other Unconsolidated Variable Interest Entities      
Variable Interest Entity [Line Items]      
Other investments 41,000,000    
Variable Interest Entity, Not Primary Beneficiary | Recurring | Indirect investments      
Variable Interest Entity [Line Items]      
Other investments 8,000,000   9,000,000
Variable Interest Entity, Not Primary Beneficiary | Investments      
Variable Interest Entity [Line Items]      
Amortization of investment 68,000,000 $ 68,000,000  
Tax credit of investment 68,000,000 66,000,000  
Other tax benefits 17,000,000 $ 17,000,000  
Variable Interest Entity, Not Primary Beneficiary | Measured at NAV | Recurring | Indirect investments      
Variable Interest Entity [Line Items]      
Other investments 8,000,000   9,000,000
Variable Interest Entity, Primary Beneficiary | Investments      
Variable Interest Entity [Line Items]      
VIE, assets that can only be used to settle obligations 0   0
VIE, liabilities $ 0   $ 0