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Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | $ 54,989 | $ 57,730
Total Accruing | 55,088 | 57,847
Current, Non-Accruing | 215 | 205
Total Non-Accruing | 347 | 386
Loans and leases | 55,435 | 58,232
30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 83 | 100
Past Due, Non-Accruing | 16 | 66
90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 16 | 17
Past Due, Non-Accruing | 116 | 115
Commercial | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 31,335 | 32,945
Total Accruing | 31,372 | 32,960
Current, Non-Accruing | 119 | 88
Total Non-Accruing | 144 | 144
Loans and leases | 31,516 | 33,104
Commercial | Commercial and industrial | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 36 | 15
Past Due, Non-Accruing | 9 | 12
Commercial | Commercial and industrial | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 1 | 0
Past Due, Non-Accruing | 16 | 44
Commercial | Commercial and industrial | C&I |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 26,196 | 27,541
Total Accruing | 26,233 | 27,556
Current, Non-Accruing | 119 | 88
Total Non-Accruing | 144 | 144
Nonaccrual, no allowance | 129 | 101
Loans and leases | 26,377 | 27,700
Commercial | Commercial and industrial | C&I | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 36 | 15
Past Due, Non-Accruing | 9 | 12
Commercial | Commercial and industrial | C&I | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 1 | 0
Past Due, Non-Accruing | 16 | 44
Commercial | Commercial and industrial | Loans to mortgage companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 5,139 | 5,404
Total Accruing | 5,139 | 5,404
Current, Non-Accruing | 0 | 0
Total Non-Accruing | 0 | 0
Loans and leases | 5,139 | 5,404
Commercial | Commercial and industrial | Loans to mortgage companies | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 0 | 0
Past Due, Non-Accruing | 0 | 0
Commercial | Commercial and industrial | Loans to mortgage companies | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 0 | 0
Past Due, Non-Accruing | 0 | 0
Commercial | Commercial and industrial | CRE |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual, no allowance | 52 |
Commercial | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 12,194 | 12,275
Commercial | Commercial real estate | CRE |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing |  | 12,194
Total Accruing |  | 12,217
Current, Non-Accruing |  | 10
Total Non-Accruing |  | 58
Loans and leases | 12,194 | 12,275
Commercial | Commercial real estate | CRE | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing |  | 23
Past Due, Non-Accruing |  | 42
Commercial | Commercial real estate | CRE | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing |  | 0
Past Due, Non-Accruing |  | 6
Commercial real estate | Commercial real estate | CRE |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 12,120 |
Total Accruing | 12,136 |
Current, Non-Accruing | 8 |
Total Non-Accruing | 58 |
Loans and leases | 12,194 |
Commercial real estate | Commercial real estate | CRE | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 15 |
Past Due, Non-Accruing | 0 |
Commercial real estate | Commercial real estate | CRE | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 1 |
Past Due, Non-Accruing | 50 |
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 10,787 | 11,725
Consumer | Consumer Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 10,604 | 11,474
Total Accruing | 10,644 | 11,543
Current, Non-Accruing | 88 | 106
Total Non-Accruing | 143 | 182
Loans and leases | 10,787 | 11,725
Consumer | Consumer Real Estate | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 28 | 53
Past Due, Non-Accruing | 6 | 12
Consumer | Consumer Real Estate | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 12 | 16
Past Due, Non-Accruing | 49 | 64
Consumer | Consumer Real Estate | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 1,979 | 2,336
Total Accruing | 1,991 | 2,360
Current, Non-Accruing | 37 | 43
Total Non-Accruing | 50 | 60
Nonaccrual, no allowance | 7 |
Loans and leases | 2,041 | 2,420
Consumer | Consumer Real Estate | HELOC | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 5 | 13
Past Due, Non-Accruing | 2 | 3
Consumer | Consumer Real Estate | HELOC | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 7 | 11
Past Due, Non-Accruing | 11 | 14
Consumer | Consumer Real Estate | Real estate installment loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 8,625 | 9,138
Total Accruing | 8,653 | 9,183
Current, Non-Accruing | 51 | 63
Total Non-Accruing | 93 | 122
Nonaccrual, no allowance | 52 |
Loans and leases | 8,746 | 9,305
Consumer | Consumer Real Estate | Real estate installment loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 23 | 40
Past Due, Non-Accruing | 4 | 9
Consumer | Consumer Real Estate | Real estate installment loans | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 5 | 5
Past Due, Non-Accruing | 38 | 50
Consumer | Credit Card and Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 930 | 1,117
Total Accruing | 936 | 1,127
Current, Non-Accruing | 0 | 1
Total Non-Accruing | 2 | 2
Loans and leases | 938 | 1,128
Consumer | Credit Card and Other | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 4 | 9
Past Due, Non-Accruing | 1 | 0
Consumer | Credit Card and Other | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 2 | 1
Past Due, Non-Accruing | 1 | 1
Consumer | Credit Card and Other | Credit Card |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 274 | 279
Total Accruing | 279 | 283
Current, Non-Accruing | 0 | 0
Total Non-Accruing | 0 | 0
Loans and leases | 279 | 283
Consumer | Credit Card and Other | Credit Card | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 3 | 3
Past Due, Non-Accruing | 0 | 0
Consumer | Credit Card and Other | Credit Card | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 2 | 1
Past Due, Non-Accruing | 0 | 0
Consumer | Credit Card and Other | Other Consumer Loans Class |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current, Accruing | 656 | 838
Total Accruing | 657 | 844
Current, Non-Accruing | 0 | 1
Total Non-Accruing | 2 | 2
Loans and leases | 659 | 845
Consumer | Credit Card and Other | Other Consumer Loans Class | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 1 | 6
Past Due, Non-Accruing | 1 | 0
Consumer | Credit Card and Other | Other Consumer Loans Class | 90+ Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due, Accruing | 0 | 0
Past Due, Non-Accruing | $ 1 | $ 1

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