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Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | $ 2,742 | $ 2,629 | $ 2,611
Charge-offs | (1,192) | (974) | (764)
Recoveries | 360 | 332 | 344
Net (charge-offs) | (832) | (642) | (420)
Provision for credit losses | 2,985 | 773 | 408
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit |  | (33) | 12
Other | 3 | 15 | 18
Ending balance | 5,361 | 2,742 | 2,629
Loans collectively evaluated for impairment - associated allowance |  | 2,277 | 2,145
Loans collectively evaluated for impairment |  | 235,498 | 221,363
Fair value option loans |  | 742 | 782
Purchased impaired loans |  | 1,719 | 2,017
Total Loans | 241,928 | 239,843 | 226,245
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 318 |  |
Provision for (recapture of) credit losses | 87 |  |
Ending balance | 584 | 318 |
Allowance for credit loss and off-balance sheet liability | 5,945 |  |
Allowances for investment securities and other financial assets | 109 |  |
TDRs |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Loans individually evaluated for impairment - associated allowance |  | 133 | 161
Loans individually evaluated for impairment |  | 1,664 | 1,851
Other Loans |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Loans individually evaluated for impairment - associated allowance |  | 58 | 48
Loans individually evaluated for impairment |  | 220 | 232
Purchased Impaired Loans |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Impaired loans - associated allowance |  | 274 | 275
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 463 |  |
Ending balance |  | 463 |
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 179 |  |
Ending balance |  | 179 |
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 3,205 |  |
Ending balance |  | 3,205 |
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 497 |  |
Ending balance |  | 497 |
Allowance for credit loss and off-balance sheet liability | 5,945 | 3,702 |
Commercial |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 1,812 | 1,663 | 1,582
Charge-offs | (407) | (216) | (124)
Recoveries | 94 | 78 | 99
Net (charge-offs) | (313) | (138) | (25)
Provision for credit losses | 2,139 | 320 | 97
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit |  | (34) | 11
Other | 3 | 1 | (2)
Ending balance | 3,337 | 1,812 | 1,663
Loans collectively evaluated for impairment - associated allowance |  | 1,714 | 1,590
Loans collectively evaluated for impairment |  | 160,021 | 151,641
Purchased impaired loans |  |  |
Total Loans | 167,203 | 160,602 | 152,282
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 316 |  |
Provision for (recapture of) credit losses | 116 |  |
Ending balance | 485 | 316 |
Allowance for credit loss and off-balance sheet liability | 3,822 |  |
Commercial | TDRs |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Loans individually evaluated for impairment - associated allowance |  | 40 | 25
Loans individually evaluated for impairment |  | 361 | 409
Commercial | Other Loans |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Loans individually evaluated for impairment - associated allowance |  | 58 | 48
Loans individually evaluated for impairment |  | 220 | 232
Commercial | Purchased Impaired Loans |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Impaired loans - associated allowance |  |  |
Commercial | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | (304) |  |
Ending balance |  | (304) |
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 53 |  |
Ending balance |  | 53 |
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 1,508 |  |
Ending balance |  | 1,508 |
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 369 |  |
Ending balance |  | 369 |
Consumer |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 930 | 966 | 1,029
Charge-offs | (785) | (758) | (640)
Recoveries | 266 | 254 | 245
Net (charge-offs) | (519) | (504) | (395)
Provision for credit losses | 846 | 453 | 311
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit |  | 1 | 1
Other |  | 14 | 20
Ending balance | 2,024 | 930 | 966
Loans collectively evaluated for impairment - associated allowance |  | 563 | 555
Loans collectively evaluated for impairment |  | 75,477 | 69,722
Fair value option loans |  | 742 | 782
Purchased impaired loans |  | 1,719 | 2,017
Total Loans | 74,725 | 79,241 | 73,963
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 2 |  |
Provision for (recapture of) credit losses | (29) |  |
Ending balance | 99 | 2 |
Allowance for credit loss and off-balance sheet liability | 2,123 |  |
Consumer | TDRs |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Loans individually evaluated for impairment - associated allowance |  | 93 | 136
Loans individually evaluated for impairment |  | 1,303 | 1,442
Consumer | Purchased Impaired Loans |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Impaired loans - associated allowance |  | 274 | $ 275
Consumer | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 767 |  |
Ending balance |  | 767 |
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | 126 |  |
Ending balance |  | 126 |
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 1,697 |  |
Ending balance |  | 1,697 |
Allowance For Unfunded Lending Related Commitments [Roll Forward] |  |  |
Beginning balance | $ 128 |  |
Ending balance |  | $ 128 |

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538 + Details
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