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Loans and Related Allowance for Credit Losses (Financial Impact and TDRs by Concession Type) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2022 USD ($) loan | Mar. 31, 2021 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | loan | 2,907 | 2,115
Pre-TDR Amortized Cost Basis | $ 89 | $ 125
Post-TDR Amortized Cost Basis | 79 | 122
Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | 26 | 16
Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | $ 53 | $ 106
Total commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | loan | 12 | 19
Pre-TDR Amortized Cost Basis | $ 53 | $ 93
Post-TDR Amortized Cost Basis | 46 | 94
Total commercial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | $ 46 | $ 94
Total consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | loan | 2,895 | 2,096
Pre-TDR Amortized Cost Basis | $ 36 | $ 32
Post-TDR Amortized Cost Basis | 33 | 28
Total consumer | Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | 26 | 16
Total consumer | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Amortized Cost Basis | $ 7 | $ 12

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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=123577603&loc=SL6953676-111524 + Details
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