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Asset Quality - Breakdown of Nonperforming TDRs by Loans Category (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) SecurityLoan | Dec. 31, 2018 USD ($) SecurityLoan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 6,212 | 6,084
Pre-modification Outstanding Recorded Investment | $ 425 | $ 491
Post-modification Outstanding Recorded Investment | $ 347 | $ 399
Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 3,590 | 3,021
Pre-modification Outstanding Recorded Investment | $ 211 | $ 195
Post-modification Outstanding Recorded Investment | $ 164 | $ 152
Nonperforming [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 2,622 | 3,063
Pre-modification Outstanding Recorded Investment | $ 214 | $ 296
Post-modification Outstanding Recorded Investment | $ 183 | $ 247
Commercial Loans [Member] | Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 7 | 13
Pre-modification Outstanding Recorded Investment | $ 30 | $ 37
Post-modification Outstanding Recorded Investment | $ 25 | $ 32
Commercial Loans [Member] | Commercial, Financial and Agricultural [Member] | Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 6 | 11
Pre-modification Outstanding Recorded Investment | $ 30 | $ 37
Post-modification Outstanding Recorded Investment | $ 25 | $ 32
Commercial Loans [Member] | Nonperforming [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 57 | 41
Pre-modification Outstanding Recorded Investment | $ 136 | $ 187
Post-modification Outstanding Recorded Investment | $ 111 | $ 147
Commercial Loans [Member] | Nonperforming [Member] | Commercial, Financial and Agricultural [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 51 | 35
Pre-modification Outstanding Recorded Investment | $ 72 | $ 121
Post-modification Outstanding Recorded Investment | $ 53 | $ 85
Commercial Real Estate Portfolio Segment [Member] | Commercial, Financial and Agricultural [Member] | Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 1 | 2
Pre-modification Outstanding Recorded Investment | $ 0 | $ 0
Post-modification Outstanding Recorded Investment | $ 0 | $ 0
Commercial Real Estate Portfolio Segment [Member] | Nonperforming [Member] | Commercial Real Estate: Commercial Mortgage [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 6 | 6
Pre-modification Outstanding Recorded Investment | $ 64 | $ 66
Post-modification Outstanding Recorded Investment | $ 58 | $ 62
Commercial Real Estate Portfolio Segment [Member] | Nonperforming [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 6 | 6
Pre-modification Outstanding Recorded Investment | $ 64 | $ 66
Post-modification Outstanding Recorded Investment | $ 58 | $ 62
Consumer Loans [Member] | Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 3,583 | 3,008
Pre-modification Outstanding Recorded Investment | $ 181 | $ 158
Post-modification Outstanding Recorded Investment | $ 139 | $ 120
Consumer Loans [Member] | Real Estate - Residential Mortgage [Member] | Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 493 | 491
Pre-modification Outstanding Recorded Investment | $ 37 | $ 36
Post-modification Outstanding Recorded Investment | $ 31 | $ 30
Consumer Loans [Member] | Home Equity Loan [Member] | Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 1,751 | 1,403
Pre-modification Outstanding Recorded Investment | $ 104 | $ 82
Post-modification Outstanding Recorded Investment | $ 84 | $ 64
Consumer Loans [Member] | Consumer Direct Loans [Member] | Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 139 | 79
Pre-modification Outstanding Recorded Investment | $ 4 | $ 4
Post-modification Outstanding Recorded Investment | $ 3 | $ 3
Consumer Loans [Member] | Consumer Credit Card [Member] | Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 486 | 479
Pre-modification Outstanding Recorded Investment | $ 3 | $ 3
Post-modification Outstanding Recorded Investment | $ 1 | $ 1
Consumer Loans [Member] | Consumer Indirect Loans [Member] | Prior-Year Accruing [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 714 | 556
Pre-modification Outstanding Recorded Investment | $ 33 | $ 33
Post-modification Outstanding Recorded Investment | $ 20 | $ 22
Consumer Loans [Member] | Nonperforming [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 2,565 | 3,022
Pre-modification Outstanding Recorded Investment | $ 78 | $ 109
Post-modification Outstanding Recorded Investment | $ 72 | $ 100
Consumer Loans [Member] | Nonperforming [Member] | Real Estate - Residential Mortgage [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 181 | 281
Pre-modification Outstanding Recorded Investment | $ 13 | $ 21
Post-modification Outstanding Recorded Investment | $ 11 | $ 20
Consumer Loans [Member] | Nonperforming [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 713 | 1,142
Pre-modification Outstanding Recorded Investment | $ 42 | $ 66
Post-modification Outstanding Recorded Investment | $ 41 | $ 63
Consumer Loans [Member] | Nonperforming [Member] | Consumer Direct Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 172 | 171
Pre-modification Outstanding Recorded Investment | $ 2 | $ 2
Post-modification Outstanding Recorded Investment | $ 2 | $ 1
Consumer Loans [Member] | Nonperforming [Member] | Consumer Credit Card [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 368 | 330
Pre-modification Outstanding Recorded Investment | $ 2 | $ 2
Post-modification Outstanding Recorded Investment | $ 2 | $ 2
Consumer Loans [Member] | Nonperforming [Member] | Consumer Indirect Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 1,131 | 1,098
Pre-modification Outstanding Recorded Investment | $ 19 | $ 18
Post-modification Outstanding Recorded Investment | $ 16 | $ 14

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