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Variable Interest Entities and Securitizations - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]      
Amortization method qualified affordable housing investments, amortization $ 159 $ 178  
Affordable housing tax credits 153 $ 184  
Amortization method qualified affordable housing investments 5,200   $ 5,300
Qualified affordable housing investments, commitment 1,900   2,100
Assets 493,604   490,144
Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 6,481   6,418
VIE, reporting entity involvement, maximum loss exposure 6,481   6,418
Consolidated      
Variable Interest Entity [Line Items]      
Assets 30,122   31,812
Affordable housing entities | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 5,506   5,544
Variable interest entity, nonconsolidated 18,100   18,100
VIE, reporting entity involvement, maximum loss exposure 5,506   5,544
Affordable housing entities | Consolidated      
Variable Interest Entity [Line Items]      
Assets 350   354
Entities that provide capital to low-income and rural communities | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 0   0
VIE, reporting entity involvement, maximum loss exposure 0   0
Entities that provide capital to low-income and rural communities | Consolidated      
Variable Interest Entity [Line Items]      
Assets 2,765   2,605
Other      
Variable Interest Entity [Line Items]      
Amortization method qualified affordable housing investments 670    
Qualified affordable housing investments, commitment 138    
Other | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 975   874
VIE, reporting entity involvement, maximum loss exposure 975   874
Other | Consolidated      
Variable Interest Entity [Line Items]      
Assets $ 0   $ 0