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Loans and Related Allowance for Credit Losses (Financial Impact and TDRs by Concession Type) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 10,866 | 6,166 | 12,343
Pre-TDR Amortized Cost Basis | $ 525 | $ 644 | $ 691
Post-TDR Amortized Cost Basis | 414 | 613 | 602
Principal Forgiveness |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 9 | 6 | 39
Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 181 | 64 | 144
Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | $ 224 | $ 543 | $ 419
Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 57 | 57 | 73
Pre-TDR Amortized Cost Basis | $ 363 | $ 536 | $ 513
Post-TDR Amortized Cost Basis | 269 | 516 | 441
Commercial | Principal Forgiveness |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 9 | 6 | 39
Commercial | Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 58 |  | 56
Commercial | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | $ 202 | $ 510 | $ 346
Consumer |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 10,809 | 6,109 | 12,270
Pre-TDR Amortized Cost Basis | $ 162 | $ 108 | $ 178
Post-TDR Amortized Cost Basis | 145 | 97 | 161
Consumer | Principal Forgiveness |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis |  |  |
Consumer | Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 123 | 64 | 88
Consumer | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | $ 22 | $ 33 | $ 73

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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 https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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