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Variable Interest Entities and Securitizations - Carrying Amount of Consolidated and Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]    
Carrying Amount of Assets $ 658,968 $ 490,144
Carrying Amount of Liabilities 548,012 429,360
Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 58,302 31,812
Carrying Amount of Liabilities 15,061 14,788
Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 7,219 6,418
Carrying Amount of Liabilities 2,145 1,987
Maximum Exposure to Loss 7,219 6,418
Affordable housing entities    
Variable Interest Entity [Line Items]    
VIE, nonconsolidated, carrying amount of assets included in certain investment structures 2,700 2,700
VIE, nonconsolidated, carrying amount of liabilities included in certain investment structures 1,100 1,000
Affordable housing entities | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 355 354
Carrying Amount of Liabilities 75 75
Affordable housing entities | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 6,068 5,544
Carrying Amount of Liabilities 1,951 1,877
Maximum Exposure to Loss 6,068 5,544
Entities that provide capital to low-income and rural communities | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 2,945 2,605
Carrying Amount of Liabilities 9 9
Entities that provide capital to low-income and rural communities | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 55 0
Carrying Amount of Liabilities 35 0
Maximum Exposure to Loss 55 0
Other | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 0 0
Carrying Amount of Liabilities 0 0
Other | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 1,096 874
Carrying Amount of Liabilities 159 110
Maximum Exposure to Loss 1,096 874
Total other VIEs | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 3,300 2,959
Carrying Amount of Liabilities 84 84
Total other VIEs | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 7,219 6,418
Carrying Amount of Liabilities 2,145 1,987
Maximum Exposure to Loss 7,219 6,418
Credit card loan securitizations | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 51,975 24,753
Carrying Amount of Liabilities 12,583 11,500
Credit card loan securitizations | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 0 0
Carrying Amount of Liabilities 0 0
Maximum Exposure to Loss 0 0
Auto loan securitizations | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 3,027 4,100
Carrying Amount of Liabilities 2,394 3,204
Auto loan securitizations | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 0 0
Carrying Amount of Liabilities 0 0
Maximum Exposure to Loss 0 0
Total securitization-related VIEs | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 55,002 28,853
Carrying Amount of Liabilities 14,977 14,704
Total securitization-related VIEs | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 0 0
Carrying Amount of Liabilities 0 0
Maximum Exposure to Loss $ 0 $ 0