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Loans and Leases - Schedule Of Troubled Debt Restructurings Occurring During The Year (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 21 | 186 | 131 | 292
Pre-Modification Outstanding Recorded Investment | $ 8 | $ 151 | $ 59 | $ 172
Post-Modification Outstanding Recorded Investment | $ 7 | $ 140 | $ 54 | $ 160
Consumer | Credit Card and Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 8 | 10 | 36 | 50
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0
C&I | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 5 | 83 | 32 | 87
Pre-Modification Outstanding Recorded Investment | $ 8 | $ 130 | $ 37 | $ 141
Post-Modification Outstanding Recorded Investment | $ 7 | $ 120 | $ 34 | $ 129
CRE | Commercial | Consumer Real Estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 0 | 14 | 1 | 14
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 12 | $ 12 | $ 12
Post-Modification Outstanding Recorded Investment | $ 0 | $ 12 | $ 10 | $ 12
HELOC | Consumer | Consumer Real Estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 2 | 35 | 21 | 47
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 3 | $ 2 | $ 4
Post-Modification Outstanding Recorded Investment | $ 0 | $ 2 | $ 2 | $ 4
Real estate installment loans | Consumer | Consumer Real Estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 6 | 44 | 41 | 94
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 6 | $ 8 | $ 15
Post-Modification Outstanding Recorded Investment | $ 0 | $ 6 | $ 8 | $ 15

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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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