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Loans and Leases - Schedule Of Troubled Debt Restructurings Occurring During The Year (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 58 | 61 | 110 | 106
Pre-Modification Outstanding Recorded Investment | $ 25 | $ 13 | $ 50 | $ 21
Post-Modification Outstanding Recorded Investment | $ 25 | $ 13 | $ 47 | $ 19
Consumer | Consumer Real Estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 33 | 44 | 54 | 62
Pre-Modification Outstanding Recorded Investment | $ 6 | $ 8 | $ 10 | $ 10
Post-Modification Outstanding Recorded Investment | $ 6 | $ 8 | $ 10 | $ 10
Consumer | Credit Card and Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 15 | 16 | 28 | 40
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 | 10 | 1 | 27 | 4
Pre-Modification Outstanding Recorded Investment | $ 19 | $ 5 | $ 28 | $ 11
Post-Modification Outstanding Recorded Investment | $ 19 | $ 5 | $ 27 | $ 9
CRE | Commercial | Consumer Real Estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 0 | 0 | 1 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 12 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 10 | $ 0
HELOC | Consumer | Consumer Real Estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 7 | 4 | 19 | 12
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 2 | $ 1
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 2 | $ 1
Real estate installment loans | Consumer | Consumer Real Estate |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number | loan | 26 | 40 | 35 | 50
Pre-Modification Outstanding Recorded Investment | $ 6 | $ 8 | $ 8 | $ 9
Post-Modification Outstanding Recorded Investment | $ 6 | $ 8 | $ 8 | $ 9

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