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Allowances for Loan and Lease Losses (Tables) | 12 Months Ended
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Dec. 31, 2019
Allowance For Loan And Lease Losses [Abstract] |
Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data | Table 46: Rollforward of Allowance for Loan and Lease Losses and Associated Loan Data
|  | 2019 | 2018 | 2017
At or for the year ended December 31 Dollars in millions |  | Commercial Lending |  |  | Consumer Lending |  |  | Total |  |  | Commercial Lending |  |  | Consumer Lending |  |  | Total |  |  | Commercial Lending |  |  | Consumer Lending |  |  | Total |  |
Allowance for Loan and Lease Losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
January 1 |  | $ | 1,663 |  |  | $ | 966 |  |  | $ | 2,629 |  |  | $ | 1,582 |  |  | $ | 1,029 |  |  | $ | 2,611 |  |  | $ | 1,534 |  |  | $ | 1,055 |  |  | $ | 2,589 |  |
Charge-offs |  | (216 | ) |  | (758 | ) |  | (974 | ) |  | (124 | ) |  | (640 | ) |  | (764 | ) |  | (221 | ) |  | (565 | ) |  | (786 | ) |
Recoveries |  | 78 |  |  | 254 |  |  | 332 |  |  | 99 |  |  | 245 |  |  | 344 |  |  | 116 |  |  | 213 |  |  | 329 |  |
Net (charge-offs) |  | (138 | ) |  | (504 | ) |  | (642 | ) |  | (25 | ) |  | (395 | ) |  | (420 | ) |  | (105 | ) |  | (352 | ) |  | (457 | ) |
Provision for credit losses |  | 320 |  |  | 453 |  |  | 773 |  |  | 97 |  |  | 311 |  |  | 408 |  |  | 147 |  |  | 294 |  |  | 441 |  |
Net decrease / (increase) in allowance for unfunded loan commitments and letters of credit |  | (34 | ) |  | 1 |  |  | (33 | ) |  | 11 |  |  | 1 |  |  | 12 |  |  | 5 |  |  | (1 | ) |  | 4 |  |
Other |  | 1 |  |  | 14 |  |  | 15 |  |  | (2 | ) |  | 20 |  |  | 18 |  |  | 1 |  |  | 33 |  |  | 34 |  |
December 31 |  | $ | 1,812 |  |  | $ | 930 |  |  | $ | 2,742 |  |  | $ | 1,663 |  |  | $ | 966 |  |  | $ | 2,629 |  |  | $ | 1,582 |  |  | $ | 1,029 |  |  | $ | 2,611 |  |
TDRs individually evaluated for impairment |  | $ | 40 |  |  | $ | 93 |  |  | $ | 133 |  |  | $ | 25 |  |  | $ | 136 |  |  | $ | 161 |  |  | $ | 35 |  |  | $ | 195 |  |  | $ | 230 |  |
Other loans individually evaluated for impairment |  | 58 |  |  |  |  | 58 |  |  | 48 |  |  |  |  |  | 48 |  |  | 41 |  |  |  |  | 41 |  |
Loans collectively evaluated for impairment |  | 1,714 |  |  | 563 |  |  | 2,277 |  |  | 1,590 |  |  | 555 |  |  | 2,145 |  |  | 1,506 |  |  | 561 |  |  | 2,067 |  |
Purchased impaired loans |  |  |  | 274 |  |  | 274 |  |  |  |  |  | 275 |  |  | 275 |  |  |  |  |  | 273 |  |  | 273 |  |
December 31 |  | $ | 1,812 |  |  | $ | 930 |  |  | $ | 2,742 |  |  | $ | 1,663 |  |  | $ | 966 |  |  | $ | 2,629 |  |  | $ | 1,582 |  |  | $ | 1,029 |  |  | $ | 2,611 |  |
Loan Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TDRs individually evaluated for impairment |  | $ | 361 |  |  | $ | 1,303 |  |  | $ | 1,664 |  |  | $ | 409 |  |  | $ | 1,442 |  |  | $ | 1,851 |  |  | $ | 409 |  |  | $ | 1,652 |  |  | $ | 2,061 |  |
Other loans individually evaluated for impairment |  | 220 |  |  |  |  | 220 |  |  | 232 |  |  |  |  |  | 232 |  |  | 310 |  |  |  |  | 310 |  |
Loans collectively evaluated for impairment |  | 160,021 |  |  | 75,477 |  |  | 235,498 |  |  | 151,641 |  |  | 69,722 |  |  | 221,363 |  |  | 146,720 |  |  | 68,102 |  |  | 214,822 |  |
Fair value option loans (a) |  |  |  | 742 |  |  | 742 |  |  |  |  |  | 782 |  |  | 782 |  |  |  |  | 869 |  |  | 869 |  |
Purchased impaired loans |  |  |  | 1,719 |  |  | 1,719 |  |  |  |  |  | 2,017 |  |  | 2,017 |  |  |  |  |  | 2,396 |  |  | 2,396 |  |
December 31 |  | $ | 160,602 |  |  | $ | 79,241 |  |  | $ | 239,843 |  |  | $ | 152,282 |  |  | $ | 73,963 |  |  | $ | 226,245 |  |  | $ | 147,439 |  |  | $ | 73,019 |  |  | $ | 220,458 |  |
Portfolio segment ALLL as a percentage of total ALLL |  | 66 | % |  | 34 | % |  | 100 | % |  | 63 | % |  | 37 | % |  | 100 | % |  | 61 | % |  | 39 | % |  | 100 | % |
Ratio of ALLL to total loans |  | 1.13 | % |  | 1.17 | % |  | 1.14 | % |  | 1.09 | % |  | 1.31 | % |  | 1.16 | % |  | 1.07 | % |  | 1.41 | % |  | 1.18 | % |
(a) Loans accounted for under the fair value option are not evaluated for impairment as these loans are accounted for at fair value. Accordingly there is no allowance recorded on these loans.

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + 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 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: 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 + Details
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