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Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses of Loans and Leases) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | $ 5,730 | $ 5,928 | $ 5,361 | $ 2,742
Acquisition PCD reserves | (59) |  | 1,056 |
Charge-offs | (206) | (247) | (877) | (865)
Recoveries | 125 | 92 | 344 | 262
Net (charge-offs) | (81) | (155) | (533) | (603)
Provision for (recapture of) credit losses | (229) | (23) | (525) | 3,149
Other | (6) | 1 | (4) |
Ending balance | 5,355 | 5,751 | 5,355 | 5,751
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 645 | 662 | 584 | 318
Acquisition PCD reserves |  |  | 46 |
Provision for (recapture of) credit losses | 1 | 27 | 16 | 192
Ending balance | 646 | 689 | 646 | 689
Allowance for credit loss | 6,001 | 6,440 | 6,001 | 6,440
Allowances for investment securities and other financial assets | 162 | 98 | 162 | 98
Total commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 3,812 | 3,380 | 3,337 | 1,812
Acquisition PCD reserves | (54) |  | 774 |
Charge-offs | (50) | (64) | (393) | (269)
Recoveries | 29 | 26 | 81 | 65
Net (charge-offs) | (21) | (38) | (312) | (204)
Provision for (recapture of) credit losses | (129) | 185 | (193) | 2,224
Other | (5) | 1 | (3) |
Ending balance | 3,603 | 3,528 | 3,603 | 3,528
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 533 | 548 | 485 | 316
Acquisition PCD reserves |  |  | 43 |
Provision for (recapture of) credit losses | 2 | 34 | 7 | 213
Ending balance | 535 | 582 | 535 | 582
Allowance for credit loss | 4,138 | 4,110 | 4,138 | 4,110
Total consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 1,918 | 2,548 | 2,024 | 930
Acquisition PCD reserves | (5) |  | 282 |
Charge-offs | (156) | (183) | (484) | (596)
Recoveries | 96 | 66 | 263 | 197
Net (charge-offs) | (60) | (117) | (221) | (399)
Provision for (recapture of) credit losses | (100) | (208) | (332) | 925
Other | (1) |  | (1) |
Ending balance | 1,752 | 2,223 | 1,752 | 2,223
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 112 | 114 | 99 | 2
Acquisition PCD reserves |  |  | 3 |
Provision for (recapture of) credit losses | (1) | (7) | 9 | (21)
Ending balance | 111 | 107 | 111 | 107
Allowance for credit loss | 1,863 | 2,330 | 1,863 | 2,330
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 463
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 179
Cumulative Effect, Period of Adoption, Adjustment | Total commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  |  |  | (304)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 53
Cumulative Effect, Period of Adoption, Adjustment | Total consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 767
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance |  |  |  | 126
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 5,730 | 5,928 | 5,361 | 3,205
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 645 | 662 | 584 | 497
Cumulative Effect, Period of Adoption, Adjusted Balance | Total commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 3,812 | 3,380 | 3,337 | 1,508
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | 533 | 548 | 485 | 369
Cumulative Effect, Period of Adoption, Adjusted Balance | Total consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 1,918 | 2,548 | 2,024 | 1,697
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |
Beginning balance | $ 112 | $ 114 | $ 99 | $ 128

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