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Allowances for Loan and Lease Losses (Rollforward of Allowance For Loan and Lease Losses and Associated Loan Data) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Balance | $ 2,629,000,000 |  | $ 2,611,000,000 |  | $ 2,589,000,000
Charge-offs | (974,000,000) |  | (764,000,000) |  | (786,000,000)
Recoveries | 332,000,000 |  | 344,000,000 |  | 329,000,000
Net charge-offs | (642,000,000) |  | (420,000,000) |  | (457,000,000)
Provision for credit losses | 773,000,000 |  | 408,000,000 |  | 441,000,000
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit | (33,000,000) |  | 12,000,000 |  | 4,000,000
Other | 15,000,000 |  | 18,000,000 |  | 34,000,000
Ending Balance | 2,742,000,000 |  | 2,629,000,000 |  | 2,611,000,000
Loans collectively evaluated for impairment - associated allowance | 2,277,000,000 |  | 2,145,000,000 |  | 2,067,000,000
Impaired loans - associated allowance | 191,000,000 |  | 209,000,000 |  |
Loans collectively evaluated for impairment | 235,498,000,000 |  | 221,363,000,000 |  | 214,822,000,000
Fair value option loans | 742,000,000 |  | 782,000,000 |  | 869,000,000
Purchased impaired loans | 1,719,000,000 |  | 2,017,000,000 |  | 2,396,000,000
Total Loans | $ 239,843,000,000 | [1],[2] | $ 226,245,000,000 | [1],[2] | $ 220,458,000,000
Portfolio segment ALLL as a percentage of total ALLL | 100.00% |  | 100.00% |  | 100.00%
Ratio of ALLL to total loans | 1.14% |  | 1.16% |  | 1.18%
Loans Accounted for under Fair Value Option |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans collectively evaluated for impairment - associated allowance | $ 0 |  | $ 0 |  | $ 0
TDRs |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans individually evaluated for impairment - associated allowance | 133,000,000 |  | 161,000,000 |  | 230,000,000
Loans individually evaluated for impairment | 1,664,000,000 |  | 1,851,000,000 |  | 2,061,000,000
Other Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans individually evaluated for impairment - associated allowance | 58,000,000 |  | 48,000,000 |  | 41,000,000
Loans individually evaluated for impairment | 220,000,000 |  | 232,000,000 |  | 310,000,000
Purchased Impaired Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Impaired loans - associated allowance | 274,000,000 |  | 275,000,000 |  | 273,000,000
Total commercial lending |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Balance | 1,663,000,000 |  | 1,582,000,000 |  | 1,534,000,000
Charge-offs | (216,000,000) |  | (124,000,000) |  | (221,000,000)
Recoveries | 78,000,000 |  | 99,000,000 |  | 116,000,000
Net charge-offs | (138,000,000) |  | (25,000,000) |  | (105,000,000)
Provision for credit losses | 320,000,000 |  | 97,000,000 |  | 147,000,000
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit | (34,000,000) |  | 11,000,000 |  | 5,000,000
Other | 1,000,000 |  | (2,000,000) |  | 1,000,000
Ending Balance | 1,812,000,000 |  | 1,663,000,000 |  | 1,582,000,000
Loans collectively evaluated for impairment - associated allowance | 1,714,000,000 |  | 1,590,000,000 |  | 1,506,000,000
Impaired loans - associated allowance | 98,000,000 |  | 73,000,000 |  |
Loans collectively evaluated for impairment | 160,021,000,000 |  | 151,641,000,000 |  | 146,720,000,000
Purchased impaired loans |  |  |  |  |
Total Loans | $ 160,602,000,000 | [1] | $ 152,282,000,000 | [1] | $ 147,439,000,000
Portfolio segment ALLL as a percentage of total ALLL | 66.00% |  | 63.00% |  | 61.00%
Ratio of ALLL to total loans | 1.13% |  | 1.09% |  | 1.07%
Total commercial lending | TDRs |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans individually evaluated for impairment - associated allowance | $ 40,000,000 |  | $ 25,000,000 |  | $ 35,000,000
Loans individually evaluated for impairment | 361,000,000 |  | 409,000,000 |  | 409,000,000
Total commercial lending | Other Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans individually evaluated for impairment - associated allowance | 58,000,000 |  | 48,000,000 |  | 41,000,000
Loans individually evaluated for impairment | 220,000,000 |  | 232,000,000 |  | 310,000,000
Total commercial lending | Purchased Impaired Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Impaired loans - associated allowance |  |  |  |  |
Total consumer lending |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Balance | 966,000,000 |  | 1,029,000,000 |  | 1,055,000,000
Charge-offs | (758,000,000) |  | (640,000,000) |  | (565,000,000)
Recoveries | 254,000,000 |  | 245,000,000 |  | 213,000,000
Net charge-offs | (504,000,000) |  | (395,000,000) |  | (352,000,000)
Provision for credit losses | 453,000,000 |  | 311,000,000 |  | 294,000,000
Net (increase) / decrease in allowance for unfunded loan commitments and letters of credit | 1,000,000 |  | 1,000,000 |  | (1,000,000)
Other | 14,000,000 |  | 20,000,000 |  | 33,000,000
Ending Balance | 930,000,000 |  | 966,000,000 |  | 1,029,000,000
Loans collectively evaluated for impairment - associated allowance | 563,000,000 |  | 555,000,000 |  | 561,000,000
Impaired loans - associated allowance | 93,000,000 |  | 136,000,000 |  |
Loans collectively evaluated for impairment | 75,477,000,000 |  | 69,722,000,000 |  | 68,102,000,000
Fair value option loans | 742,000,000 |  | 782,000,000 |  | 869,000,000
Purchased impaired loans | 1,719,000,000 |  | 2,017,000,000 |  | 2,396,000,000
Total Loans | $ 79,241,000,000 | [1] | $ 73,963,000,000 | [1] | $ 73,019,000,000
Portfolio segment ALLL as a percentage of total ALLL | 34.00% |  | 37.00% |  | 39.00%
Ratio of ALLL to total loans | 1.17% |  | 1.31% |  | 1.41%
Total consumer lending | TDRs |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans individually evaluated for impairment - associated allowance | $ 93,000,000 |  | $ 136,000,000 |  | $ 195,000,000
Loans individually evaluated for impairment | 1,303,000,000 |  | 1,442,000,000 |  | 1,652,000,000
Total consumer lending | Purchased Impaired Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Impaired loans - associated allowance | $ 274,000,000 |  | $ 275,000,000 |  | $ 273,000,000
[1] | Net of unearned income, unamortized deferred fees and costs on originated loans, and premiums or discounts on purchased loans totaling $1.1 billion and $1.2 billion December 31, 2019 and 2018, respectively.
[2] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.1 billion, Loans of $.7 billion, and Other assets of $.1 billion at December 31, 2019 and Loans held for sale of $.9 billion, Loans of $.8 billion, and Other assets of $.2 billion at December 31, 2018.

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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 Reflects the percentage derived from dividing the allowance for loan and lease losses by total loans. + References No definition available. + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + 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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