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Variable Interest Entities and Securitizations - Additional Information (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Variable Interest Entity [Line Items]      
Amortization method qualified affordable housing investments, amortization $ 527 $ 522  
Affordable housing tax credits 671 $ 652  
Amortization method qualified affordable housing investments 5,300   $ 5,500
Qualified affordable housing investments, commitment 2,100   2,300
Assets 486,433   478,464
VIE, reporting entity involvement, maximum loss exposure 5,854   6,175
Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 5,854   6,175
Consolidated      
Variable Interest Entity [Line Items]      
Assets 30,466   33,288
Affordable housing entities      
Variable Interest Entity [Line Items]      
VIE, reporting entity involvement, maximum loss exposure 5,469   5,726
Affordable housing entities | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 5,469   5,726
Total assets of the unconsolidated VIE investment funds 18,700   18,600
Affordable housing entities | Consolidated      
Variable Interest Entity [Line Items]      
Assets 354   297
Entities that provide capital to low-income and rural communities      
Variable Interest Entity [Line Items]      
VIE, reporting entity involvement, maximum loss exposure 0   0
Entities that provide capital to low-income and rural communities | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 0   0
Entities that provide capital to low-income and rural communities | Consolidated      
Variable Interest Entity [Line Items]      
Assets 2,639   2,498
Other      
Variable Interest Entity [Line Items]      
VIE, reporting entity involvement, maximum loss exposure 385   449
Other | Unconsolidated      
Variable Interest Entity [Line Items]      
Assets 385   449
Other | Consolidated      
Variable Interest Entity [Line Items]      
Assets $ 0   $ 0