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Loans and Related Allowance for Credit Losses (Financial Impact and TDRs by Concession Type) (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 USD ($) customer | Sep. 30, 2022 USD ($) customer
Financing Receivable [Line Items] |  |
Number of Loans | customer | 2,247 | 8,194
Pre-TDR Amortized Cost Basis | $ 136 | $ 310
Post-TDR Amortized Cost Basis | 112 | 267
Principal Forgiveness |  |
Financing Receivable [Line Items] |  |
Post-TDR Amortized Cost Basis |  | 9
Interest Rate Reduction |  |
Financing Receivable [Line Items] |  |
Post-TDR Amortized Cost Basis | 39 | 105
Other |  |
Financing Receivable [Line Items] |  |
Post-TDR Amortized Cost Basis | $ 73 | $ 153
Total commercial |  |
Financing Receivable [Line Items] |  |
Number of Loans | customer | 15 | 42
Pre-TDR Amortized Cost Basis | $ 96 | $ 184
Post-TDR Amortized Cost Basis | 77 | 154
Total commercial | Principal Forgiveness |  |
Financing Receivable [Line Items] |  |
Post-TDR Amortized Cost Basis |  | 9
Total commercial | Interest Rate Reduction |  |
Financing Receivable [Line Items] |  |
Post-TDR Amortized Cost Basis | 10 | 10
Total commercial | Other |  |
Financing Receivable [Line Items] |  |
Post-TDR Amortized Cost Basis | $ 67 | $ 135
Total consumer |  |
Financing Receivable [Line Items] |  |
Number of Loans | customer | 2,232 | 8,152
Pre-TDR Amortized Cost Basis | $ 40 | $ 126
Post-TDR Amortized Cost Basis | 35 | 113
Total consumer | Principal Forgiveness |  |
Financing Receivable [Line Items] |  |
Post-TDR Amortized Cost Basis |  |
Total consumer | Interest Rate Reduction |  |
Financing Receivable [Line Items] |  |
Post-TDR Amortized Cost Basis | 29 | 95
Total consumer | Other |  |
Financing Receivable [Line Items] |  |
Post-TDR Amortized Cost Basis | $ 6 | $ 18

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