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Variable Interest Entities and Securitizations - Additional Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]      
Amortization method qualified affordable housing investments, amortization $ 339 $ 356  
Affordable housing tax credits 376 $ 414  
Amortization method qualified affordable housing investments 5,700   $ 5,300
Qualified affordable housing investments, commitment 2,100   2,100
Assets 658,968   490,144
Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 7,219   6,418
VIE, reporting entity involvement, maximum loss exposure 7,219   6,418
Consolidated      
Variable Interest Entity [Line Items]      
Assets 58,302   31,812
Affordable housing entities | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 6,068   5,544
Variable interest entity, nonconsolidated 18,700   18,100
VIE, reporting entity involvement, maximum loss exposure 6,068   5,544
Affordable housing entities | Consolidated      
Variable Interest Entity [Line Items]      
Assets 355   354
Entities that provide capital to low-income and rural communities | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 55   0
VIE, reporting entity involvement, maximum loss exposure 55   0
Entities that provide capital to low-income and rural communities | Consolidated      
Variable Interest Entity [Line Items]      
Assets 2,945   2,605
Other      
Variable Interest Entity [Line Items]      
Amortization method qualified affordable housing investments 760    
Qualified affordable housing investments, commitment 159    
Other | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 1,096   874
VIE, reporting entity involvement, maximum loss exposure 1,096   874
Other | Consolidated      
Variable Interest Entity [Line Items]      
Assets $ 0   $ 0