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Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data) (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |
Beginning balance | $ 2,742 | $ 2,629
Charge-offs | (618) | (442)
Recoveries | 170 | 164
Net (charge-offs) | (448) | (278)
Provision for credit losses | 3,172 | 369
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit |  | (6)
Other |  | 7
Loans collectively evaluated for impairment - associated allowance |  | 2,230
Ending balance | 5,928 | 2,721
Loans collectively evaluated for impairment |  | 232,525
Fair value option loans |  | 755
Purchased impaired loans |  | 1,871
Total loans |  | 237,215
TDRs [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Loans individually evaluated for impairment - associated allowance |  | 156
Loans individually evaluated for impairment |  | 1,777
Other Loans [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Loans individually evaluated for impairment - associated allowance |  | 53
Loans individually evaluated for impairment |  | 287
Purchased Impaired Loans [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Impaired loans - associated allowance |  | 282
Total commercial |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Beginning balance | 1,812 | 1,663
Charge-offs | (205) | (84)
Recoveries | 39 | 40
Net (charge-offs) | (166) | (44)
Provision for credit losses | 2,039 | 187
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit |  | (7)
Other |  |
Loans collectively evaluated for impairment - associated allowance |  | 1,713
Ending balance | 3,380 | 1,799
Loans collectively evaluated for impairment |  | 160,920
Purchased impaired loans |  |
Total loans |  | 161,603
Total commercial | TDRs [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Loans individually evaluated for impairment - associated allowance |  | 33
Loans individually evaluated for impairment |  | 396
Total commercial | Other Loans [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Loans individually evaluated for impairment - associated allowance |  | 53
Loans individually evaluated for impairment |  | 287
Total commercial | Purchased Impaired Loans [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Impaired loans - associated allowance |  |
Total consumer |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Beginning balance | 930 | 966
Charge-offs | (413) | (358)
Recoveries | 131 | 124
Net (charge-offs) | (282) | (234)
Provision for credit losses | 1,133 | 182
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit |  | 1
Other |  | 7
Loans collectively evaluated for impairment - associated allowance |  | 517
Ending balance | $ 2,548 | 922
Loans collectively evaluated for impairment |  | 71,605
Fair value option loans |  | 755
Purchased impaired loans |  | 1,871
Total loans |  | 75,612
Total consumer | TDRs [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Loans individually evaluated for impairment - associated allowance |  | 123
Loans individually evaluated for impairment |  | 1,381
Total consumer | Purchased Impaired Loans [Member] |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |
Impaired loans - associated allowance |  | $ 282

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- Definition Represents loans accounted for under the fair value option and included in the loan portfolio that are not evaluated for impairment because they are accounted for at fair value. There is no allowance recorded on these loans. + References No definition available. + Details
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- Definition Net change in allowance for unfunded loan commitments and letters of credit which is included in the provision for credit losses. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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=118939070&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=118938799&loc=d3e13503-111538 + Details
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- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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