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Asset Quality - Breakdown of Nonperforming TDRs by Loans Category (Detail)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
SecurityLoan
Jun. 30, 2015
USD ($)
SecurityLoan
Dec. 31, 2015
USD ($)
SecurityLoan
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 4,627 4,684 4,622
Pre-modification Outstanding Recorded Investment $ 356 $ 388 $ 364
Post-modification Outstanding Recorded Investment $ 277 $ 300 $ 280
Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 2,037 2,011 2,122
Pre-modification Outstanding Recorded Investment $ 163 $ 219 $ 203
Post-modification Outstanding Recorded Investment $ 133 $ 170 $ 159
Consumer Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 2,015   2,098
Pre-modification Outstanding Recorded Investment $ 111   $ 117
Post-modification Outstanding Recorded Investment $ 100   $ 107
Commercial Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 22 24 24
Pre-modification Outstanding Recorded Investment $ 52 $ 106 $ 86
Post-modification Outstanding Recorded Investment $ 33 $ 66 $ 52
Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 2,590 2,673 2,500
Pre-modification Outstanding Recorded Investment $ 193 $ 169 $ 161
Post-modification Outstanding Recorded Investment $ 144 $ 130 $ 121
Prior-Year Accruing [Member] | Consumer Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 2,584 2,658 2,493
Pre-modification Outstanding Recorded Investment $ 163 $ 161 $ 156
Post-modification Outstanding Recorded Investment $ 124 $ 126 $ 119
Prior-Year Accruing [Member] | Commercial Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 6 15 7
Pre-modification Outstanding Recorded Investment $ 30 $ 8 $ 5
Post-modification Outstanding Recorded Investment $ 20 $ 4 $ 2
Commercial, Financial and Agricultural [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan     12
Pre-modification Outstanding Recorded Investment     $ 56
Post-modification Outstanding Recorded Investment     $ 45
Commercial, Financial and Agricultural [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 14 12  
Pre-modification Outstanding Recorded Investment $ 50 $ 74  
Post-modification Outstanding Recorded Investment $ 32 $ 58  
Commercial, Financial and Agricultural [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 6 14 7
Pre-modification Outstanding Recorded Investment $ 30 $ 6 $ 5
Post-modification Outstanding Recorded Investment $ 20 $ 3 $ 2
Commercial Real Estate: Commercial Mortgage [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan     12
Pre-modification Outstanding Recorded Investment     $ 30
Post-modification Outstanding Recorded Investment     $ 7
Commercial Real Estate: Commercial Mortgage [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 8 12  
Pre-modification Outstanding Recorded Investment $ 2 $ 32  
Post-modification Outstanding Recorded Investment $ 1 $ 8  
Commercial Real Estate: Commercial Mortgage [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   1  
Pre-modification Outstanding Recorded Investment   $ 2  
Post-modification Outstanding Recorded Investment   $ 1  
Real Estate - Residential Mortgage [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 307 352 366
Pre-modification Outstanding Recorded Investment $ 19 $ 21 $ 23
Post-modification Outstanding Recorded Investment $ 19 $ 21 $ 23
Real Estate - Residential Mortgage [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 536 491 489
Pre-modification Outstanding Recorded Investment $ 35 $ 36 $ 34
Post-modification Outstanding Recorded Investment $ 35 $ 36 $ 34
Home Equity Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 1,332 1,193 1,262
Pre-modification Outstanding Recorded Investment $ 86 $ 80 $ 85
Post-modification Outstanding Recorded Investment $ 76 $ 73 $ 76
Home Equity Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 1,116 1,138 1,071
Pre-modification Outstanding Recorded Investment $ 64 $ 58 $ 57
Post-modification Outstanding Recorded Investment $ 54 $ 50 $ 49
Consumer Direct Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 28 28 28
Pre-modification Outstanding Recorded Investment $ 1 $ 1 $ 1
Post-modification Outstanding Recorded Investment $ 1 $ 1 $ 1
Consumer Direct Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 39 48 42
Pre-modification Outstanding Recorded Investment $ 2 $ 2 $ 2
Post-modification Outstanding Recorded Investment $ 2 $ 2 $ 2
Consumer Credit Card Financing Receivable [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 267 289 339
Pre-modification Outstanding Recorded Investment $ 1 $ 2 $ 2
Post-modification Outstanding Recorded Investment $ 1 $ 2 $ 2
Consumer Credit Card Financing Receivable [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 478 489 461
Pre-modification Outstanding Recorded Investment $ 3 $ 3 $ 4
Post-modification Outstanding Recorded Investment $ 2 $ 2 $ 2
Consumer Indirect Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 81 125 103
Pre-modification Outstanding Recorded Investment $ 4 $ 9 $ 6
Post-modification Outstanding Recorded Investment $ 3 $ 7 $ 5
Consumer Indirect Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 415 492 430
Pre-modification Outstanding Recorded Investment $ 59 $ 62 $ 59
Post-modification Outstanding Recorded Investment $ 31 $ 36 $ 32
Commercial Real Estate Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan     12
Pre-modification Outstanding Recorded Investment     $ 30
Post-modification Outstanding Recorded Investment     $ 7
Commercial Real Estate Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 8 12  
Pre-modification Outstanding Recorded Investment $ 2 $ 32  
Post-modification Outstanding Recorded Investment $ 1 $ 8  
Commercial Real Estate Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   1  
Pre-modification Outstanding Recorded Investment   $ 2  
Post-modification Outstanding Recorded Investment   $ 1  
Consumer And Other Financing Receivable [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   1,987  
Pre-modification Outstanding Recorded Investment   $ 113  
Post-modification Outstanding Recorded Investment   $ 104