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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, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 12,343 | 14,623 | 12,181
Pre-TDR Amortized Cost Basis | $ 691 |  |
Post-TDR Amortized Cost Basis | 602 |  |
Pre-TDR Recorded Investment |  | $ 450 | $ 435
Post-TDR Recorded Investment |  | 413 | 398
Principal Forgiveness |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 39 |  |
Post-TDR Recorded Investment |  |  | 3
Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 144 |  |
Post-TDR Recorded Investment |  | 108 | 153
Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | $ 419 |  |
Post-TDR Recorded Investment |  | $ 305 | $ 242
Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 73 | 75 | 85
Pre-TDR Amortized Cost Basis | $ 513 |  |
Post-TDR Amortized Cost Basis | 441 |  |
Pre-TDR Recorded Investment |  | $ 278 | $ 272
Post-TDR Recorded Investment |  | 252 | 248
Commercial | Principal Forgiveness |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 39 |  |
Post-TDR Recorded Investment |  |  | 2
Commercial | Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 56 |  |
Post-TDR Recorded Investment |  | 11 | 67
Commercial | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | $ 346 |  |
Post-TDR Recorded Investment |  | $ 241 | $ 179
Consumer |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Loans | loan | 12,270 | 14,548 | 12,096
Pre-TDR Amortized Cost Basis | $ 178 |  |
Post-TDR Amortized Cost Basis | 161 |  |
Pre-TDR Recorded Investment |  | $ 172 | $ 163
Post-TDR Recorded Investment |  | 161 | 150
Consumer | Principal Forgiveness |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Recorded Investment |  |  | 1
Consumer | Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | 88 |  |
Post-TDR Recorded Investment |  | 97 | 86
Consumer | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post-TDR Amortized Cost Basis | $ 73 |  |
Post-TDR Recorded Investment |  | $ 64 | $ 63

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