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Asset Quality - Breakdown of Nonperforming TDRs by Loans Category (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
SecurityLoan
Dec. 31, 2015
USD ($)
SecurityLoan
Dec. 31, 2014
USD ($)
SecurityLoan
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 4,515 4,622 4,776
Pre-modification Outstanding Recorded Investment $ 389 $ 364 $ 349
Post-modification Outstanding Recorded Investment $ 280 $ 280 $ 270
Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 2,535 2,500 2,385
Pre-modification Outstanding Recorded Investment $ 196 $ 161 $ 149
Post-modification Outstanding Recorded Investment $ 139 $ 121 $ 113
Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   2,122  
Pre-modification Outstanding Recorded Investment   $ 203  
Post-modification Outstanding Recorded Investment   $ 159  
Nonperforming [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 1,980   2,391
Pre-modification Outstanding Recorded Investment $ 193   $ 200
Post-modification Outstanding Recorded Investment $ 141   $ 157
Commercial Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   7  
Pre-modification Outstanding Recorded Investment   $ 5  
Post-modification Outstanding Recorded Investment   $ 2  
Commercial Loans [Member] | Commercial, Financial and Agricultural [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 5 7 20
Pre-modification Outstanding Recorded Investment $ 30 $ 5 $ 6
Post-modification Outstanding Recorded Investment $ 16 $ 2 $ 3
Commercial Loans [Member] | 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
Commercial Loans [Member] | 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
Commercial Loans [Member] | Commercial Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 5   21
Pre-modification Outstanding Recorded Investment $ 30   $ 8
Post-modification Outstanding Recorded Investment $ 16   $ 4
Commercial Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   24  
Pre-modification Outstanding Recorded Investment   $ 86  
Post-modification Outstanding Recorded Investment   $ 52  
Commercial Loans [Member] | Nonperforming [Member] | 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 Loans [Member] | Nonperforming [Member] | Commercial, Financial and Agricultural [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 18   14
Pre-modification Outstanding Recorded Investment $ 91   $ 25
Post-modification Outstanding Recorded Investment $ 50   $ 23
Commercial Loans [Member] | Nonperforming [Member] | 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 Loans [Member] | Nonperforming [Member] | Commercial Real Estate: Commercial Mortgage [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 7   10
Pre-modification Outstanding Recorded Investment $ 2   $ 38
Post-modification Outstanding Recorded Investment $ 1   $ 13
Commercial Loans [Member] | Nonperforming [Member] | Commercial Real Estate: Construction [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan     1
Pre-modification Outstanding Recorded Investment     $ 5
Post-modification Outstanding Recorded Investment     $ 0
Commercial Loans [Member] | Nonperforming [Member] | 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 Loans [Member] | Nonperforming [Member] | Commercial Real Estate Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 7   11
Pre-modification Outstanding Recorded Investment $ 2   $ 43
Post-modification Outstanding Recorded Investment $ 1   $ 13
Commercial Loans [Member] | Nonperforming [Member] | Commercial Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 25   25
Pre-modification Outstanding Recorded Investment $ 93   $ 68
Post-modification Outstanding Recorded Investment $ 51   $ 36
Consumer Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   2,493  
Pre-modification Outstanding Recorded Investment   $ 156  
Post-modification Outstanding Recorded Investment   $ 119  
Consumer Loans [Member] | Real Estate - Residential Mortgage [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 477 489 381
Pre-modification Outstanding Recorded Investment $ 35 $ 34 $ 29
Post-modification Outstanding Recorded Investment $ 35 $ 34 $ 29
Consumer Loans [Member] | Home Equity Loan [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 1,231 1,071 984
Pre-modification Outstanding Recorded Investment $ 70 $ 57 $ 50
Post-modification Outstanding Recorded Investment $ 57 $ 49 $ 44
Consumer Loans [Member] | Consumer Direct Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 35 42 45
Pre-modification Outstanding Recorded Investment $ 2 $ 2 $ 2
Post-modification Outstanding Recorded Investment $ 2 $ 2 $ 2
Consumer Loans [Member] | Consumer Credit Card [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 410 461 514
Pre-modification Outstanding Recorded Investment $ 3 $ 4 $ 4
Post-modification Outstanding Recorded Investment $ 1 $ 2 $ 2
Consumer Loans [Member] | Consumer Indirect Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 377 430 440
Pre-modification Outstanding Recorded Investment $ 56 $ 59 $ 56
Post-modification Outstanding Recorded Investment $ 28 $ 32 $ 32
Consumer Loans [Member] | Consumer Loans [Member] | Prior-Year Accruing [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 2,530   2,364
Pre-modification Outstanding Recorded Investment $ 166   $ 141
Post-modification Outstanding Recorded Investment $ 123   $ 109
Consumer Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   2,098  
Pre-modification Outstanding Recorded Investment   $ 117  
Post-modification Outstanding Recorded Investment   $ 107  
Consumer Loans [Member] | Nonperforming [Member] | Real Estate - Residential Mortgage [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   366  
Pre-modification Outstanding Recorded Investment   $ 23  
Post-modification Outstanding Recorded Investment   $ 23  
Consumer Loans [Member] | Nonperforming [Member] | Real Estate - Residential Mortgage [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 264   453
Pre-modification Outstanding Recorded Investment $ 16   $ 27
Post-modification Outstanding Recorded Investment $ 16   $ 27
Consumer Loans [Member] | Nonperforming [Member] | Home Equity Loan [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 1,199 1,262  
Pre-modification Outstanding Recorded Investment $ 77 $ 85  
Post-modification Outstanding Recorded Investment $ 69 $ 76  
Consumer Loans [Member] | Nonperforming [Member] | Home Equity Loan [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan     1,342
Pre-modification Outstanding Recorded Investment     $ 83
Post-modification Outstanding Recorded Investment     $ 76
Consumer Loans [Member] | Nonperforming [Member] | Consumer Direct Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   28  
Pre-modification Outstanding Recorded Investment   $ 1  
Post-modification Outstanding Recorded Investment   $ 1  
Consumer Loans [Member] | Nonperforming [Member] | Consumer Direct Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 32   37
Pre-modification Outstanding Recorded Investment $ 1   $ 2
Post-modification Outstanding Recorded Investment $ 0   $ 1
Consumer Loans [Member] | Nonperforming [Member] | Consumer Credit Card [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan   339  
Pre-modification Outstanding Recorded Investment   $ 2  
Post-modification Outstanding Recorded Investment   $ 2  
Consumer Loans [Member] | Nonperforming [Member] | Consumer Credit Card [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 336   290
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, Modifications [Line Items]      
Number of Loans | SecurityLoan 124 103  
Pre-modification Outstanding Recorded Investment $ 4 $ 6  
Post-modification Outstanding Recorded Investment $ 3 $ 5  
Consumer Loans [Member] | Nonperforming [Member] | Consumer Indirect Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan     244
Pre-modification Outstanding Recorded Investment     $ 18
Post-modification Outstanding Recorded Investment     $ 15
Consumer Loans [Member] | Nonperforming [Member] | Consumer Loans [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Number of Loans | SecurityLoan 1,955   2,366
Pre-modification Outstanding Recorded Investment $ 100   $ 132
Post-modification Outstanding Recorded Investment $ 90   $ 121