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Loans and Related Allowance for Credit Losses (Financial Impact and TDRs by Concession Type) (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) loan | Mar. 31, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | loan | 2,115 | 3,580
Pre-TDR Amortized Cost Basis | $ 125 | $ 98
Post-TDR Amortized Cost Basis | 122 | 75
Principal Forgiveness |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis |  | 6
Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | 16 | 22
Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | $ 106 | $ 47
Total commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | loan | 19 | 13
Pre-TDR Amortized Cost Basis | $ 93 | $ 62
Post-TDR Amortized Cost Basis | 94 | 43
Total commercial | Principal Forgiveness |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis |  | 6
Total commercial | Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis |  |
Total commercial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | $ 94 | $ 37
Total consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | loan | 2,096 | 3,567
Pre-TDR Amortized Cost Basis | $ 32 | $ 36
Post-TDR Amortized Cost Basis | 28 | 32
Total consumer | Principal Forgiveness |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis |  |
Total consumer | Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | 16 | 22
Total consumer | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | $ 12 | $ 10

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- Definition Financing Receivable, Troubled Debt Restructuring, Premodification, Amortized Cost + References No definition available. + Details
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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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