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Asset Quality - Changes in Allowance for Loan and Lease Losses by Loan Category (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | $ 1,626 | $ 900 |  |
Provision | (74) | 339 |  |
Charge-offs | (135) | (101) |  |
Recoveries | 21 | 17 |  |
Ending balance | 1,438 | 1,359 |  |
Total ALLL, including discontinued operations | 1,471 | 1,402 | $ 1,662 | $ 910
Total provision, including discontinued operations | (77) | 342 |  |
Total charge-offs, including discontinued operations | (136) | (103) |  |
Total recoveries, including discontinued operations | 22 | 18 |  |
Provision (credit) for losses on lending-related commitments | (19) | 20 |  |
Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 204 |  |
Total ALLL, including discontinued operations |  |  |  | 235
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 1,104 |  |
Total ALLL, including discontinued operations |  |  |  | $ 1,145
Commercial Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 1,099 | 751 |  |
Provision | (60) | 250 |  |
Charge-offs | (112) | (65) |  |
Recoveries | 10 | 6 |  |
Ending balance | 937 | 818 |  |
Commercial Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | (124) |  |
Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 627 |  |
Consumer Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 527 | 149 |  |
Provision | (14) | 89 |  |
Charge-offs | (23) | (36) |  |
Recoveries | 11 | 11 |  |
Ending balance | 501 | 541 |  |
Consumer Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 328 |  |
Consumer Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 477 |  |
Commercial and Industrial | Commercial Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 678 | 551 |  |
Provision | (17) | 187 |  |
Charge-offs | (73) | (60) |  |
Recoveries | 8 | 5 |  |
Ending balance | 596 | 542 |  |
Commercial and Industrial | Commercial Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | (141) |  |
Commercial and Industrial | Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 410 |  |
Commercial mortgage | Commercial Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 327 | 143 |  |
Provision | (37) | 50 |  |
Charge-offs | (35) | (3) |  |
Recoveries | 1 | 1 |  |
Ending balance | 256 | 207 |  |
Commercial mortgage | Commercial Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 16 |  |
Commercial mortgage | Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 159 |  |
Construction | Commercial Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 47 | 22 |  |
Provision | (2) | 10 |  |
Charge-offs | 0 | 0 |  |
Recoveries | 0 | 0 |  |
Ending balance | 45 | 25 |  |
Construction | Commercial Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | (7) |  |
Construction | Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 15 |  |
Commercial real estate loans | Commercial Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 374 | 165 |  |
Provision | (39) | 60 |  |
Charge-offs | (35) | (3) |  |
Recoveries | 1 | 1 |  |
Ending balance | 301 | 232 |  |
Commercial real estate loans | Commercial Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 9 |  |
Commercial real estate loans | Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 174 |  |
Commercial lease financing | Commercial Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 47 | 35 |  |
Provision | (4) | 3 |  |
Charge-offs | (4) | (2) |  |
Recoveries | 1 | 0 |  |
Ending balance | 40 | 44 |  |
Commercial lease financing | Commercial Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 8 |  |
Commercial lease financing | Commercial Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 43 |  |
Real estate — residential mortgage | Consumer Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 102 | 7 |  |
Provision | (3) | 5 |  |
Charge-offs | 0 | 0 |  |
Recoveries | 1 | 0 |  |
Ending balance | 100 | 89 |  |
Real estate — residential mortgage | Consumer Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 77 |  |
Real estate — residential mortgage | Consumer Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 84 |  |
Home equity loans | Consumer Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 171 | 31 |  |
Provision | (13) | 8 |  |
Charge-offs | (2) | (4) |  |
Recoveries | 1 | 2 |  |
Ending balance | 157 | 184 |  |
Home equity loans | Consumer Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 147 |  |
Home equity loans | Consumer Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 178 |  |
Consumer direct loans | Consumer Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 128 | 34 |  |
Provision | 4 | 29 |  |
Charge-offs | (8) | (12) |  |
Recoveries | 2 | 2 |  |
Ending balance | 126 | 116 |  |
Consumer direct loans | Consumer Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 63 |  |
Consumer direct loans | Consumer Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 97 |  |
Credit cards | Consumer Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 87 | 47 |  |
Provision | (3) | 31 |  |
Charge-offs | (6) | (11) |  |
Recoveries | 2 | 2 |  |
Ending balance | 80 | 104 |  |
Credit cards | Consumer Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 35 |  |
Credit cards | Consumer Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 82 |  |
Consumer indirect loans | Consumer Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 39 | 30 |  |
Provision | 1 | 16 |  |
Charge-offs | (7) | (9) |  |
Recoveries | 5 | 5 |  |
Ending balance | 38 | 48 |  |
Consumer indirect loans | Consumer Loans | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 6 |  |
Consumer indirect loans | Consumer Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 36 |  |
Discontinued Operations |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 36 | 10 |  |
Provision | (3) | 3 |  |
Charge-offs | (1) | (2) |  |
Recoveries | 1 | 1 |  |
Ending balance | $ 33 | 43 |  |
Discontinued Operations | Impact of ASC 326 Adoption |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | 31 |  |
Discontinued Operations | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  | $ 41 |  |

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