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Variable Interest Entities and Securitizations - Carrying Amount of Consolidated and Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Carrying Amount of Assets $ 490,144 $ 478,464
Carrying Amount of Liabilities 429,360 420,375
Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 31,812 33,288
Carrying Amount of Liabilities 14,788 18,746
Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 6,418 6,175
Carrying Amount of Liabilities 1,987 2,085
Maximum Exposure to Loss 6,418 6,175
Affordable housing entities    
Variable Interest Entity [Line Items]    
VIE, nonconsolidated, carrying amount of assets included in certain investment structures 2,700 2,600
VIE, nonconsolidated, carrying amount of liabilities included in certain investment structures 1,000 989
Affordable housing entities | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 354 297
Carrying Amount of Liabilities 75 23
Affordable housing entities | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 5,544 5,726
Carrying Amount of Liabilities 1,877 2,085
Maximum Exposure to Loss 5,544 5,726
Entities that provide capital to low-income and rural communities | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 2,605 2,498
Carrying Amount of Liabilities 9 10
Entities that provide capital to low-income and rural communities | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 0 0
Carrying Amount of Liabilities 0 0
Maximum Exposure to Loss 0 0
Other    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss   449
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 874 449
Carrying Amount of Liabilities 110 0
Maximum Exposure to Loss 874 449
Total other VIEs | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 2,959 2,795
Carrying Amount of Liabilities 84 33
Total other VIEs | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 6,418 6,175
Carrying Amount of Liabilities 1,987 2,085
Maximum Exposure to Loss 6,418 6,175
Credit card loan securitizations | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 24,753 25,474
Carrying Amount of Liabilities 11,500 14,692
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 4,100 5,019
Carrying Amount of Liabilities 3,204 4,021
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 28,853 30,493
Carrying Amount of Liabilities 14,704 18,713
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