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Loans and Leases - Accruing And Non-Accruing Loans By Class (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | $ 56,246 |  | $ 57,730 |  |  |
Total Accruing | 56,343 |  | 57,847 |  |  |
Current, Non-Accruing | 205 |  | 205 |  |  |
Total Non-Accruing | 344 |  | 386 |  |  |
Loans and leases | 56,687 |  | 58,232 |  |  |
Allowance for loan and lease losses | 815 | $ 914 | 963 | $ 538 | $ 445 | $ 307
30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 83 |  | 100 |  |  |
Past Due, Non-Accruing | 8 |  | 66 |  |  |
90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 14 |  | 17 |  |  |
Past Due, Non-Accruing | 131 |  | 115 |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 32,364 |  | 32,945 |  |  |
Total Accruing | 32,405 |  | 32,960 |  |  |
Current, Non-Accruing | 93 |  | 88 |  |  |
Total Non-Accruing | 123 |  | 144 |  |  |
Loans and leases | 32,528 |  | 33,104 |  |  |
Allowance for loan and lease losses | 385 | 442 | 453 | 319 | 255 | 142
Commercial | Commercial and industrial | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 40 |  | 15 |  |  |
Past Due, Non-Accruing | 2 |  | 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 | 28 |  | 44 |  |  |
Commercial | Commercial and industrial | C&I |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 27,488 |  | 27,541 |  |  |
Total Accruing | 27,529 |  | 27,556 |  |  |
Current, Non-Accruing | 93 |  | 88 |  |  |
Total Non-Accruing | 123 |  | 144 |  |  |
Nonaccrual, no allowance | 103 |  | 101 |  |  |
Loans and leases | 27,652 |  | 27,700 |  |  |
Commercial | Commercial and industrial | C&I | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 40 |  | 15 |  |  |
Past Due, Non-Accruing | 2 |  | 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 | 28 |  | 44 |  |  |
Commercial | Commercial and industrial | Loans to mortgage companies |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 4,876 |  | 5,404 |  |  |
Total Accruing | 4,876 |  | 5,404 |  |  |
Current, Non-Accruing | 0 |  | 0 |  |  |
Total Non-Accruing | 0 |  | 0 |  |  |
Loans and leases | 4,876 |  | 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 real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 12,292 |  | 12,275 |  |  |
Allowance for loan and lease losses | 210 | 232 | 242 | 57 | 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 |  |  |
Loans and leases | 12,292 |  | 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 | 12,216 |  |  |  |  |
Total Accruing | 12,222 |  |  |  |  |
Current, Non-Accruing | 18 |  |  |  |  |
Total Non-Accruing | 70 |  |  |  |  |
Loans and leases | 12,292 |  |  |  |  |
Commercial real estate | Commercial real estate | CRE | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 6 |  |  |  |  |
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 | 0 |  |  |  |  |
Past Due, Non-Accruing | 52 |  |  |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases | 10,865 |  | 11,725 |  |  |
Consumer | Consumer Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 10,674 |  | 11,474 |  |  |
Total Accruing | 10,716 |  | 11,543 |  |  |
Current, Non-Accruing | 93 |  | 106 |  |  |
Total Non-Accruing | 149 |  | 182 |  |  |
Loans and leases | 10,865 |  | 11,725 |  |  |
Allowance for loan and lease losses | 203 | 222 | 242 | 144 | 123 | 121
Consumer | Consumer Real Estate | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 30 |  | 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 | 50 |  | 64 |  |  |
Consumer | Consumer Real Estate | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 2,083 |  | 2,336 |  |  |
Total Accruing | 2,097 |  | 2,360 |  |  |
Current, Non-Accruing | 41 |  | 43 |  |  |
Total Non-Accruing | 54 |  | 60 |  |  |
Nonaccrual, no allowance | 23 |  |  |  |  |
Loans and leases | 2,151 |  | 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 | 8 |  | 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 | 8,591 |  | 9,138 |  |  |
Total Accruing | 8,619 |  | 9,183 |  |  |
Current, Non-Accruing | 52 |  | 63 |  |  |
Total Non-Accruing | 95 |  | 122 |  |  |
Nonaccrual, no allowance | 8 |  |  |  |  |
Loans and leases | 8,714 |  | 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 | 24 |  | 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 | 4 |  | 5 |  |  |
Past Due, Non-Accruing | 39 |  | 50 |  |  |
Consumer | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 992 |  | 1,117 |  |  |
Total Accruing | 1,000 |  | 1,127 |  |  |
Current, Non-Accruing | 1 |  | 1 |  |  |
Total Non-Accruing | 2 |  | 2 |  |  |
Loans and leases | 1,002 |  | 1,128 |  |  |
Allowance for loan and lease losses | 17 | $ 18 | 26 | $ 18 | $ 19 | $ 15
Consumer | Credit Card and Other | 30-89 Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 7 |  | 9 |  |  |
Past Due, Non-Accruing | 0 |  | 0 |  |  |
Consumer | Credit Card and Other | 90+ Days Past Due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past Due, Accruing | 1 |  | 1 |  |  |
Past Due, Non-Accruing | 1 |  | 1 |  |  |
Consumer | Credit Card and Other | Credit Card |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Current, Accruing | 267 |  | 279 |  |  |
Total Accruing | 270 |  | 283 |  |  |
Current, Non-Accruing | 0 |  | 0 |  |  |
Total Non-Accruing | 0 |  | 0 |  |  |
Loans and leases | 270 |  | 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 | 1 |  | 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 | 725 |  | 838 |  |  |
Total Accruing | 730 |  | 844 |  |  |
Current, Non-Accruing | 1 |  | 1 |  |  |
Total Non-Accruing | 2 |  | 2 |  |  |
Loans and leases | 732 |  | 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 | 5 |  | 6 |  |  |
Past Due, Non-Accruing | 0 |  | 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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