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Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | $ 58,112 | $ 57,730 |  |
Total Accruing | 58,206 | 57,847 |  |
Current, Non-Accruing | 238 | 205 |  |
Total Non-Accruing | 394 | 386 |  |
Total loans, net of unearned income | 58,600 | 58,232 |  |
Allowance for loan and lease losses | 914 | 963 | $ 444 | $ 307
30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 81 | 100 |  |
Past Due, Non-Accruing | 21 | 66 |  |
90+ Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 13 | 17 |  |
Past Due, Non-Accruing | 135 | 115 |  |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, net of unearned income | 33,951 | 33,104 |  |
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | 33,781 | 32,945 |  |
Total Accruing | 33,807 | 32,960 |  |
Current, Non-Accruing | 102 | 88 |  |
Total Non-Accruing | 144 | 144 |  |
Total loans, net of unearned income | 33,951 | 33,104 |  |
Allowance for loan and lease losses | 442 | 453 | 255 | 142
Commercial | Commercial and industrial | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 26 | 15 |  |
Past Due, Non-Accruing | 7 | 12 |  |
Commercial | Commercial and industrial | 90+ Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 0 | 0 |  |
Past Due, Non-Accruing | 35 | 44 |  |
Commercial | Commercial and industrial | C&I |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | 28,251 | 27,541 |  |
Total Accruing | 28,277 | 27,556 |  |
Current, Non-Accruing | 102 | 88 |  |
Total Non-Accruing | 144 | 144 |  |
Total loans, net of unearned income | 28,421 | 27,700 |  |
Nonaccrual, no allowance | 100 | 101 |  |
Commercial | Commercial and industrial | C&I | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 26 | 15 |  |
Past Due, Non-Accruing | 7 | 12 |  |
Commercial | Commercial and industrial | C&I | 90+ Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 0 | 0 |  |
Past Due, Non-Accruing | 35 | 44 |  |
Commercial | Commercial and industrial | Loans to mortgage companies |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | 5,530 | 5,404 |  |
Total Accruing | 5,530 | 5,404 |  |
Current, Non-Accruing | 0 | 0 |  |
Total Non-Accruing | 0 | 0 |  |
Total loans, net of unearned income | 5,530 | 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 | TRUPS |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, net of unearned income | 210 | 210 |  |
Allowance for loan and lease losses | 18 | 18 |  |
Commercial | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, net of unearned income | 12,470 | 12,275 |  |
Allowance for loan and lease losses | 232 | 242 | 48 | 29
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 |  |
Total loans, net of unearned income | 12,470 | 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 |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans, net of unearned income | 11,053 | 11,725 |  |
Consumer | Consumer Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | 10,821 | 11,474 |  |
Total Accruing | 10,873 | 11,543 |  |
Current, Non-Accruing | 115 | 106 |  |
Total Non-Accruing | 180 | 182 |  |
Total loans, net of unearned income | 11,053 | 11,725 |  |
Allowance for loan and lease losses | 222 | 242 | 122 | 121
Consumer | Consumer Real Estate | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 39 | 53 |  |
Past Due, Non-Accruing | 10 | 12 |  |
Consumer | Consumer Real Estate | 90+ Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 13 | 16 |  |
Past Due, Non-Accruing | 55 | 64 |  |
Consumer | Consumer Real Estate | HELOC |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | 2,198 | 2,336 |  |
Total Accruing | 2,213 | 2,360 |  |
Current, Non-Accruing | 43 | 43 |  |
Total Non-Accruing | 57 | 60 |  |
Total loans, net of unearned income | 2,270 | 2,420 |  |
Consumer | Consumer Real Estate | HELOC | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 6 | 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 | 9 | 11 |  |
Past Due, Non-Accruing | 12 | 14 |  |
Consumer | Consumer Real Estate | R/E Installment Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | 8,623 | 9,138 |  |
Total Accruing | 8,660 | 9,183 |  |
Current, Non-Accruing | 72 | 63 |  |
Total Non-Accruing | 123 | 122 |  |
Total loans, net of unearned income | 8,783 | 9,305 |  |
Consumer | Consumer Real Estate | R/E Installment Loans | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 33 | 40 |  |
Past Due, Non-Accruing | 8 | 9 |  |
Consumer | Consumer Real Estate | R/E Installment Loans | 90+ Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 4 | 5 |  |
Past Due, Non-Accruing | 43 | 50 |  |
Consumer | Credit Card and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | 1,118 | 1,117 |  |
Total Accruing | 1,123 | 1,127 |  |
Current, Non-Accruing | 1 | 1 |  |
Total Non-Accruing | 3 | 2 |  |
Total loans, net of unearned income | 1,126 | 1,128 |  |
Allowance for loan and lease losses | 18 | 26 | $ 19 | $ 15
Consumer | Credit Card and Other | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 5 | 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 | 0 | 1 |  |
Past Due, Non-Accruing | 1 | 1 |  |
Consumer | Credit Card and Other | Credit Card |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | 273 | 279 |  |
Total Accruing | 275 | 283 |  |
Current, Non-Accruing | 0 | 0 |  |
Total Non-Accruing | 0 | 0 |  |
Total loans, net of unearned income | 275 | 283 |  |
Consumer | Credit Card and Other | Credit Card | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 2 | 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 | 0 | 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 | 845 | 838 |  |
Total Accruing | 848 | 844 |  |
Current, Non-Accruing | 1 | 1 |  |
Total Non-Accruing | 3 | 2 |  |
Total loans, net of unearned income | 851 | 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 | 3 | 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 |  |
Commercial real estate | Commercial real estate | CRE |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Current, Accruing | 12,392 |  |  |
Total Accruing | 12,403 |  |  |
Current, Non-Accruing | 20 |  |  |
Total Non-Accruing | 67 |  |  |
Total loans, net of unearned income | 12,470 |  |  |
Commercial real estate | Commercial real estate | CRE | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 11 |  |  |
Past Due, Non-Accruing | 3 |  |  |
Commercial real estate | Commercial real estate | CRE | 90+ Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due, Accruing | 0 |  |  |
Past Due, Non-Accruing | $ 44 |  |  |

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