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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 ($) customer | Dec. 31, 2021 USD ($) customer
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | customer | 10,866 | 6,166
Pre-TDR Recorded Investment | $ 525 | $ 644
Post-TDR Recorded Investment | 414 | 613
Principal Forgiveness |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Recorded Investment | 9 | 6
Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Recorded Investment | 181 | 64
Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Recorded Investment | $ 224 | $ 543
Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | customer | 57 | 57
Pre-TDR Recorded Investment | $ 363 | $ 536
Post-TDR Recorded Investment | 269 | 516
Commercial | Principal Forgiveness |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Recorded Investment | 9 | 6
Commercial | Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Recorded Investment | 58 |
Commercial | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Recorded Investment | $ 202 | $ 510
Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | customer | 10,809 | 6,109
Pre-TDR Recorded Investment | $ 162 | $ 108
Post-TDR Recorded Investment | 145 | 97
Consumer | Principal Forgiveness |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Recorded Investment |  |
Consumer | Rate Reduction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Recorded Investment | 123 | 64
Consumer | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Post-TDR Recorded Investment | $ 22 | $ 33

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