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Variable Interest Entities and Securitizations - Additional Information (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]      
Amortization method qualified affordable housing investments, amortization $ 515 $ 527  
Affordable housing tax credits 605 $ 671  
Amortization method qualified affordable housing investments 5,800   $ 5,300
Qualified affordable housing investments, commitment 2,100   2,100
Assets 661,877   490,144
Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 7,317   6,418
VIE, reporting entity involvement, maximum loss exposure 7,317   6,418
Consolidated      
Variable Interest Entity [Line Items]      
Assets 60,153   31,812
Affordable housing entities | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 6,120   5,544
Variable interest entity, nonconsolidated 18,200   18,100
VIE, reporting entity involvement, maximum loss exposure 6,120   5,544
Affordable housing entities | Consolidated      
Variable Interest Entity [Line Items]      
Assets 358   354
Entities that provide capital to low-income and rural communities | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 51   0
VIE, reporting entity involvement, maximum loss exposure 51   0
Entities that provide capital to low-income and rural communities | Consolidated      
Variable Interest Entity [Line Items]      
Assets 2,821   2,605
Other      
Variable Interest Entity [Line Items]      
Amortization method qualified affordable housing investments 728    
Qualified affordable housing investments, commitment 153    
Other | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 1,146   874
VIE, reporting entity involvement, maximum loss exposure 1,146   874
Other | Consolidated      
Variable Interest Entity [Line Items]      
Assets $ 0   $ 0