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Asset Quality - Changes in Allowance for Loan and Lease Losses by Loan Category (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 1,337 | $ 1,061 | $ 1,626
Provision | 415 | 437 | (381)
Charge-offs | (318) | (245) | (322)
Recoveries | 74 | 84 | 138
Ending balance | 1,508 | 1,337 | 1,061
Total ALLL, including discontinued operations, beginning balance | 1,358 | 1,089 | 1,662
Total provision, including discontinued operations | 413 | 434 | (387)
Total charge-offs, including discontinued operations | (322) | (251) | (326)
Total recoveries, including discontinued operations | 75 | 86 | 140
Total ALLL, including discontinued operations, ending balance | 1,524 | 1,358 | 1,089
Provision (credit) for losses on lending-related commitments | 74 | 65 | (37)
Total commercial loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 864 | 688 | 1,099
Provision | 371 | 294 | (290)
Charge-offs | (227) | (178) | (220)
Recoveries | 52 | 60 | 99
Ending balance | 1,060 | 864 | 688
Total consumer loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 473 | 373 | 527
Provision | 44 | 143 | (91)
Charge-offs | (91) | (67) | (102)
Recoveries | 22 | 24 | 39
Ending balance | 448 | 473 | 373
Commercial and Industrial | Total commercial loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 601 | 445 | 678
Provision | 99 | 259 | (142)
Charge-offs | (188) | (153) | (174)
Recoveries | 44 | 50 | 83
Ending balance | 556 | 601 | 445
Commercial mortgage | Total commercial loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 203 | 182 | 327
Provision | 253 | 39 | (114)
Charge-offs | (39) | (23) | (40)
Recoveries | 2 | 5 | 9
Ending balance | 419 | 203 | 182
Construction | Total commercial loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 28 | 29 | 47
Provision | 23 | (2) | (18)
Charge-offs | 0 | 0 | 0
Recoveries | 1 | 1 | 0
Ending balance | 52 | 28 | 29
Total commercial real estate loans | Total commercial loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 231 | 211 | 374
Provision | 276 | 37 | (132)
Charge-offs | (39) | (23) | (40)
Recoveries | 3 | 6 | 9
Ending balance | 471 | 231 | 211
Commercial lease financing | Total commercial loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 32 | 32 | 47
Provision | (4) | (2) | (16)
Charge-offs | 0 | (2) | (6)
Recoveries | 5 | 4 | 7
Ending balance | 33 | 32 | 32
Real estate — residential mortgage | Total consumer loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 196 |  |
Provision | (37) |  |
Charge-offs | (1) |  |
Recoveries | 4 |  |
Ending balance | 162 | 196 |
Real estate — residential mortgage | Total consumer loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 196 | 95 | 102
Provision |  | 94 | (12)
Charge-offs |  | 2 | 2
Recoveries |  | 5 | 3
Ending balance |  | 196 | 95
Home equity loans | Total consumer loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 98 | 110 | 171
Provision | (13) | (14) | (57)
Charge-offs | (2) | (1) | (9)
Recoveries | 3 | 3 | 5
Ending balance | 86 | 98 | 110
Consumer direct loans | Total consumer loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 111 | 105 | 128
Provision | 53 | 32 | (2)
Charge-offs | (50) | (34) | (29)
Recoveries | 7 | 8 | 8
Ending balance | 121 | 111 | 105
Credit cards | Total consumer loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 66 | 61 | 87
Provision | 42 | 29 | (7)
Charge-offs | (37) | (30) | (27)
Recoveries | 7 | 6 | 8
Ending balance | 78 | 66 | 61
Consumer indirect loans | Total consumer loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 2 | 2 | 39
Provision | (1) | 2 | (13)
Charge-offs | (1) | (4) | (39)
Recoveries | 1 | 2 | 15
Ending balance | 1 | 2 | 2
Discontinued operations |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 21 | 28 | 36
Provision | (2) | (3) | (6)
Charge-offs | (4) | (6) | (4)
Recoveries | 1 | 2 | 2
Ending balance | $ 16 | $ 21 | $ 28

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