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Loans and Leases - Schedule Of Troubled Debt Restructurings Occurring During The Year (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) loan | Mar. 31, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 52 | 45
Pre-Modification Outstanding Recorded Investment | $ 24 | $ 9
Post-Modification Outstanding Recorded Investment | $ 22 | $ 7
Consumer | Consumer Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 21 | 18
Pre-Modification Outstanding Recorded Investment | $ 4 | $ 3
Post-Modification Outstanding Recorded Investment | $ 4 | $ 3
Consumer | Credit Card and Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 13 | 24
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0
C&I | Commercial | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 17 | 3
Pre-Modification Outstanding Recorded Investment | $ 8 | $ 6
Post-Modification Outstanding Recorded Investment | $ 8 | $ 4
CRE | Commercial | Consumer Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 1 | 0
Pre-Modification Outstanding Recorded Investment | $ 12 | $ 0
Post-Modification Outstanding Recorded Investment | $ 10 | $ 0
HELOC | Consumer | Consumer Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 12 | 8
Pre-Modification Outstanding Recorded Investment | $ 2 | $ 1
Post-Modification Outstanding Recorded Investment | $ 2 | $ 1
R/E Installment Loans | Consumer | Consumer Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number | loan | 9 | 10
Pre-Modification Outstanding Recorded Investment | $ 2 | $ 2
Post-Modification Outstanding Recorded Investment | $ 2 | $ 2

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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=121611835&loc=SL6953676-111524 + Details
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