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Variable Interest Entities and Securitizations - Carrying Amount of Consolidated and Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss $ 5,095 $ 5,157
Carrying Amount of Assets 444,232 432,381
Carrying Amount of Liabilities 393,371 371,352
Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 28,560 26,458
Carrying Amount of Liabilities 16,892 15,256
Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 5,095 5,157
Carrying Amount of Liabilities 1,495 1,454
Affordable housing entities    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 4,754 4,774
VIE, nonconsolidated, carrying amount of assets included in certain investment structures 2,200 2,200
VIE, nonconsolidated, carrying amount of liabilities included in certain investment structures 562 568
Affordable housing entities | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 259 263
Carrying Amount of Liabilities 20 27
Affordable housing entities | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 4,754 4,774
Carrying Amount of Liabilities 1,495 1,454
Entities that provide capital to low-income and rural communities    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 0 0
Entities that provide capital to low-income and rural communities | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 2,337 2,074
Carrying Amount of Liabilities 10 26
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
Other    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 341 383
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 341 383
Carrying Amount of Liabilities 0 0
Total other VIEs    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 5,095 5,157
Total other VIEs | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 2,596 2,337
Carrying Amount of Liabilities 30 53
Total other VIEs | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 5,095 5,157
Carrying Amount of Liabilities 1,495 1,454
Credit card loan securitizations    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 0 0
Credit card loan securitizations | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 20,544 21,569
Carrying Amount of Liabilities 12,374 13,016
Credit card loan securitizations | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 0 0
Carrying Amount of Liabilities 0 0
Auto loan securitizations    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 0 0
Auto loan securitizations | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 5,420 2,552
Carrying Amount of Liabilities 4,488 2,187
Auto loan securitizations | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 0 0
Carrying Amount of Liabilities 0 0
Total securitization-related VIEs    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss 0 0
Total securitization-related VIEs | Consolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 25,964 24,121
Carrying Amount of Liabilities 16,862 15,203
Total securitization-related VIEs | Unconsolidated    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets 0 0
Carrying Amount of Liabilities $ 0 $ 0