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Loans and Related Allowance for Credit Losses (Financial Impact and TDRs by Concession Type) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) loan | Jun. 30, 2021 USD ($) loan | Jun. 30, 2022 USD ($) loan | Jun. 30, 2021 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan | 3,040 | 1,397 | 5,947 | 3,512
Pre-TDR Amortized Cost Basis | $ 85 | $ 127 | $ 174 | $ 252
Post-TDR Amortized Cost Basis | 76 | 103 | 155 | 225
Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | 40 | 12 | 66 | 28
Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | 27 | $ 91 | 80 | $ 197
Principal Forgiveness |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | $ 9 |  | $ 9 |
Total commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan | 15 | 11 | 27 | 30
Pre-TDR Amortized Cost Basis | $ 35 | $ 104 | $ 88 | $ 197
Post-TDR Amortized Cost Basis | 31 | 82 | 77 | 176
Total commercial | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | 22 | $ 82 | 68 | $ 176
Total commercial | Principal Forgiveness |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | $ 9 |  | $ 9 |
Total consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan | 3,025 | 1,386 | 5,920 | 3,482
Pre-TDR Amortized Cost Basis | $ 50 | $ 23 | $ 86 | $ 55
Post-TDR Amortized Cost Basis | 45 | 21 | 78 | 49
Total consumer | Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | 40 | 12 | 66 | 28
Total consumer | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | $ 5 | $ 9 | $ 12 | $ 21

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