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Loans and Leases - Schedule Of Troubled Debt Restructurings Occurring During The Year (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 196 | 368
Pre-Modification Outstanding Recorded Investment | $ 66 | $ 236
Post-Modification Outstanding Recorded Investment | $ 61 | $ 228
Consumer | Credit card and other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 51 | 56
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 1
Post-Modification Outstanding Recorded Investment | $ 0 | $ 1
C&I (a) | Commercial | C&I |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 32 | 112
Pre-Modification Outstanding Recorded Investment | $ 37 | $ 195
Post-Modification Outstanding Recorded Investment | $ 34 | $ 188
CRE (b) | Commercial | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 1 | 19
Pre-Modification Outstanding Recorded Investment | $ 12 | $ 15
Post-Modification Outstanding Recorded Investment | $ 10 | $ 15
HELOC (c) | Consumer | Consumer real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 25 | 64
Pre-Modification Outstanding Recorded Investment | $ 3 | $ 5
Post-Modification Outstanding Recorded Investment | $ 3 | $ 5
Real estate installment loans | Consumer | Consumer real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 87 | 117
Pre-Modification Outstanding Recorded Investment | $ 14 | $ 20
Post-Modification Outstanding Recorded Investment | $ 14 | $ 19

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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