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Asset Quality - Breakdown of Nonperforming TDRs by Loans Category (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) SecurityLoan | Dec. 31, 2020 USD ($) SecurityLoan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 6,007 | 6,133
Pre-modification Outstanding Recorded Investment | $ 501 | $ 478
Post-modification Outstanding Recorded Investment | $ 376 | $ 363
Prior-Year accruing |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 3,931 | 3,743
Pre-modification Outstanding Recorded Investment | $ 231 | $ 184
Post-modification Outstanding Recorded Investment | $ 184 | $ 134
Prior-Year accruing | Commercial Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 12 | 3
Pre-modification Outstanding Recorded Investment | $ 43 | $ 5
Post-modification Outstanding Recorded Investment | $ 41 | $ 0
Prior-Year accruing | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 3,919 | 3,740
Pre-modification Outstanding Recorded Investment | $ 188 | $ 179
Post-modification Outstanding Recorded Investment | $ 143 | $ 134
Nonperforming financial instruments |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 2,076 | 2,390
Pre-modification Outstanding Recorded Investment | $ 270 | $ 294
Post-modification Outstanding Recorded Investment | $ 192 | $ 229
Nonperforming financial instruments | Commercial Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 62 | 73
Pre-modification Outstanding Recorded Investment | $ 190 | $ 198
Post-modification Outstanding Recorded Investment | $ 121 | $ 142
Nonperforming financial instruments | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 2,014 | 2,317
Pre-modification Outstanding Recorded Investment | $ 80 | $ 96
Post-modification Outstanding Recorded Investment | $ 71 | $ 87
Commercial and Industrial | Prior-Year accruing | Commercial Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 12 | 3
Pre-modification Outstanding Recorded Investment | $ 43 | $ 5
Post-modification Outstanding Recorded Investment | $ 41 | $ 0
Commercial and Industrial | Nonperforming financial instruments | Commercial Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 57 | 66
Pre-modification Outstanding Recorded Investment | $ 128 | $ 136
Post-modification Outstanding Recorded Investment | $ 87 | $ 92
Commercial mortgage | Prior-Year accruing | Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 0 | 0
Pre-modification Outstanding Recorded Investment | $ 0 | $ 0
Post-modification Outstanding Recorded Investment | $ 0 | $ 0
Commercial mortgage | Nonperforming financial instruments | Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 5 | 7
Pre-modification Outstanding Recorded Investment | $ 62 | $ 62
Post-modification Outstanding Recorded Investment | $ 34 | $ 50
Commercial real estate loans | Prior-Year accruing | Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 0 | 0
Pre-modification Outstanding Recorded Investment | $ 0 | $ 0
Post-modification Outstanding Recorded Investment | $ 0 | $ 0
Commercial real estate loans | Nonperforming financial instruments | Commercial Real Estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 5 | 7
Pre-modification Outstanding Recorded Investment | $ 62 | $ 62
Post-modification Outstanding Recorded Investment | $ 34 | $ 50
Real estate — residential mortgage | Prior-Year accruing | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 513 | 485
Pre-modification Outstanding Recorded Investment | $ 44 | $ 37
Post-modification Outstanding Recorded Investment | $ 39 | $ 31
Real estate — residential mortgage | Nonperforming financial instruments | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 206 | 258
Pre-modification Outstanding Recorded Investment | $ 25 | $ 35
Post-modification Outstanding Recorded Investment | $ 24 | $ 34
Home equity loans | Prior-Year accruing | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 1,779 | 1,781
Pre-modification Outstanding Recorded Investment | $ 107 | $ 106
Post-modification Outstanding Recorded Investment | $ 84 | $ 83
Home equity loans | Nonperforming financial instruments | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 564 | 630
Pre-modification Outstanding Recorded Investment | $ 35 | $ 41
Post-modification Outstanding Recorded Investment | $ 32 | $ 37
Consumer direct loans | Prior-Year accruing | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 202 | 163
Pre-modification Outstanding Recorded Investment | $ 5 | $ 4
Post-modification Outstanding Recorded Investment | $ 3 | $ 3
Consumer direct loans | Nonperforming financial instruments | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 203 | 212
Pre-modification Outstanding Recorded Investment | $ 4 | $ 3
Post-modification Outstanding Recorded Investment | $ 3 | $ 3
Credit cards | Prior-Year accruing | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 638 | 536
Pre-modification Outstanding Recorded Investment | $ 4 | $ 3
Post-modification Outstanding Recorded Investment | $ 2 | $ 1
Credit cards | Nonperforming financial instruments | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 265 | 356
Pre-modification Outstanding Recorded Investment | $ 2 | $ 2
Post-modification Outstanding Recorded Investment | $ 2 | $ 2
Consumer indirect loans | Prior-Year accruing | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 787 | 775
Pre-modification Outstanding Recorded Investment | $ 28 | $ 29
Post-modification Outstanding Recorded Investment | $ 15 | $ 16
Consumer indirect loans | Nonperforming financial instruments | Consumer Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Loans | SecurityLoan | 776 | 861
Pre-modification Outstanding Recorded Investment | $ 14 | $ 15
Post-modification Outstanding Recorded Investment | $ 10 | $ 11

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