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v3.21.2

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, 2021 USD ($) loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan | 1,397 | 3,618 | 3,512 | 7,198
Pre-TDR Amortized Cost Basis | $ 127 | $ 204 | $ 252 | $ 302
Post-TDR Amortized Cost Basis | 103 | 212 | 225 | 287
Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | 12 | 19 | 28 | 41
Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | $ 91 | 160 | $ 197 | 207
Principal Forgiveness |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis |  | $ 33 |  | $ 39
Total commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan | 11 | 29 | 30 | 42
Pre-TDR Amortized Cost Basis | $ 104 | $ 147 | $ 197 | $ 209
Post-TDR Amortized Cost Basis | 82 | 158 | 176 | 201
Total commercial | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | $ 82 | 125 | $ 176 | 162
Total commercial | Principal Forgiveness |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis |  | $ 33 |  | $ 39
Total consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of Loans | loan | 1,386 | 3,589 | 3,482 | 7,156
Pre-TDR Amortized Cost Basis | $ 23 | $ 57 | $ 55 | $ 93
Post-TDR Amortized Cost Basis | 21 | 54 | 49 | 86
Total consumer | Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | 12 | 19 | 28 | 41
Total consumer | Other |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Post-TDR Amortized Cost Basis | $ 9 | $ 35 | $ 21 | $ 45

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