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Asset Quality - Aging Analysis of Past Due and Current Loans (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 99,915 | $ 100,073
Days Past Due | 1,011 | 1,112
Total | 100,926 | 101,185
Accrued interest | 242 | 241
Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 70,781 | 71,299
Days Past Due | 633 | 681
Total | 71,414 | 71,980
Accrued interest | 143 | 140
Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 29,134 | 28,774
Days Past Due | 378 | 431
Total | 29,512 | 29,205
Accrued interest | 98 | 101
Commercial and Industrial | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 52,000 | 52,396
Days Past Due | 486 | 511
Total | 52,486 | 52,907
Commercial mortgage | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 12,580 | 12,548
Days Past Due | 122 | 139
Total | 12,702 | 12,687
Commercial real estate: Construction | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,113 | 1,986
Days Past Due | 9 | 1
Total | 2,122 | 1,987
Commercial real estate loans | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 14,693 | 14,534
Days Past Due | 131 | 140
Total | 14,824 | 14,674
Commercial lease financing | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 4,088 | 4,369
Days Past Due | 16 | 30
Total | 4,104 | 4,399
Real estate — residential mortgage | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 10,190 | 9,173
Days Past Due | 110 | 125
Total | 10,300 | 9,298
Home equity loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 8,958 | 9,143
Days Past Due | 200 | 217
Total | 9,158 | 9,360
Consumer direct loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 4,844 | 4,694
Days Past Due | 18 | 20
Total | 4,862 | 4,714
Commercial credit card | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 126 | 127
Commercial credit card | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 892 | 972
Days Past Due | 17 | 17
Total | 909 | 989
Consumer indirect loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 4,250 | 4,792
Days Past Due | 33 | 52
Total | 4,283 | 4,844
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 134 | 148
30-59 Days Past Due | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 74 | 66
30-59 Days Past Due | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 60 | 82
30-59 Days Past Due | Commercial and Industrial | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 42 | 36
30-59 Days Past Due | Commercial mortgage | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 17 | 9
30-59 Days Past Due | Commercial real estate: Construction | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 8 | 0
30-59 Days Past Due | Commercial real estate loans | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 25 | 9
30-59 Days Past Due | Commercial lease financing | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 7 | 21
30-59 Days Past Due | Real estate — residential mortgage | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 9 | 11
30-59 Days Past Due | Home equity loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 31 | 34
30-59 Days Past Due | Consumer direct loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 4 | 7
30-59 Days Past Due | Commercial credit card | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 4 | 5
30-59 Days Past Due | Consumer indirect loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 12 | 25
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 57 | 93
60-89 Days Past Due | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 32 | 56
60-89 Days Past Due | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 25 | 37
60-89 Days Past Due | Commercial and Industrial | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 16 | 50
60-89 Days Past Due | Commercial mortgage | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 14 | 5
60-89 Days Past Due | Commercial real estate: Construction | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 1 | 0
60-89 Days Past Due | Commercial real estate loans | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 15 | 5
60-89 Days Past Due | Commercial lease financing | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 1 | 1
60-89 Days Past Due | Real estate — residential mortgage | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 4 | 3
60-89 Days Past Due | Home equity loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 11 | 20
60-89 Days Past Due | Consumer direct loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 4 | 4
60-89 Days Past Due | Commercial credit card | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 3 | 3
60-89 Days Past Due | Consumer indirect loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 3 | 7
90 and Greater Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 92 | 86
90 and Greater Days Past Due | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 66 | 62
90 and Greater Days Past Due | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 26 | 24
90 and Greater Days Past Due | Commercial and Industrial | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 41 | 40
90 and Greater Days Past Due | Commercial mortgage | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 25 | 21
90 and Greater Days Past Due | Commercial real estate: Construction | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 0 | 1
90 and Greater Days Past Due | Commercial real estate loans | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 25 | 22
90 and Greater Days Past Due | Commercial lease financing | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 0 | 0
90 and Greater Days Past Due | Real estate — residential mortgage | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 2 | 1
90 and Greater Days Past Due | Home equity loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 10 | 9
90 and Greater Days Past Due | Consumer direct loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 5 | 4
90 and Greater Days Past Due | Commercial credit card | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 7 | 7
90 and Greater Days Past Due | Consumer indirect loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 2 | 3
Nonperforming financial instruments |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 728 | 785
Nonperforming financial instruments | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 461 | 497
Nonperforming financial instruments | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 267 | 288
Nonperforming financial instruments | Commercial and Industrial | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 387 | 385
Nonperforming financial instruments | Commercial mortgage | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 66 | 104
Nonperforming financial instruments | Commercial real estate: Construction | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 0 | 0
Nonperforming financial instruments | Commercial real estate loans | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 66 | 104
Nonperforming financial instruments | Commercial lease financing | Commercial Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 8 | 8
Nonperforming financial instruments | Real estate — residential mortgage | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 95 | 110
Nonperforming financial instruments | Home equity loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 148 | 154
Nonperforming financial instruments | Consumer direct loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 5 | 5
Nonperforming financial instruments | Commercial credit card | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | 3 | 2
Nonperforming financial instruments | Consumer indirect loans | Consumer Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Days Past Due | $ 16 | $ 17

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