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LHFI Considered Impaired (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Document Period End Date Mar. 31, 2017    
Impaired Financing Receivable, Unpaid Principal Balance $ 3,395   $ 3,434
Impaired Financing Receivable, Recorded Investment [1] 3,037   3,068
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 246   255
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 3,116 $ 3,220  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 32 32  
Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 255   266
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 187   214
Impaired Financing Receivable, Unpaid Principal Balance 203   225
Impaired Financing Receivable, Recorded Investment [1] 148   151
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 25   31
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 240 364  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 1 2  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 165 161  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 1 0  
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 26   26
Impaired Financing Receivable, Recorded Investment [1] 17   17
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 5   2
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 3  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 0 0  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 17 0  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 [2] 0  
Commercial Portfolio Segment [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 255   266
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 187   214
Impaired Financing Receivable, Unpaid Principal Balance 229   251
Impaired Financing Receivable, Recorded Investment [1] 165   168
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 30   33
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 240 367  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 1 2  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 182 161  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 1 0  
Residential Nonguaranteed [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 468   466
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 362   360
Impaired Financing Receivable, Unpaid Principal Balance 1,239   1,277
Impaired Financing Receivable, Recorded Investment [1] 1,211   1,248
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 141   150
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 360 387  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 4 4  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,216 1,339  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 15 16  
Home Equity Line of Credit [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 894   863
Impaired Financing Receivable, Recorded Investment [1] 829   795
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 57   54
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 833 705  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 8 7  
Residential Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 16   16
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 8   8
Impaired Financing Receivable, Unpaid Principal Balance 105   109
Impaired Financing Receivable, Recorded Investment [1] 105   107
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 10   11
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 8 8  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 0 0  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 105 120  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 1 2  
Residential Portfolio Segment [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 484   482
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 370   368
Impaired Financing Receivable, Unpaid Principal Balance 2,238   2,249
Impaired Financing Receivable, Recorded Investment [1] 2,145   2,150
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 208   215
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 368 395  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 4 4  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 2,154 2,164  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 24 25  
Consumer Other Direct [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 59   59 [3]
Impaired Financing Receivable, Recorded Investment [1] 59   59 [3]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1   1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 58 12  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 1 [2] 0  
Consumer Indirect [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 106   103
Impaired Financing Receivable, Recorded Investment [1] 105   103
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 6   5
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 108 115  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 1 1  
Credit Card Receivable [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 24   24
Impaired Financing Receivable, Recorded Investment [1] 6   6
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1   1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 6 6  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 0 0  
Consumer Portfolio Segment [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 189   186
Impaired Financing Receivable, Recorded Investment [1] 170   168
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 8   $ 7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 172 133  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] $ 2 $ 1  
[1] Amortized cost reflects charge-offs that have been recognized plus other amounts that have been applied to adjust the net book balance.
[2] Of the interest income recognized during the three months ended March 31, 2017 and 2016, cash basis interest income was less than $1 million and $2 million, respectively.
[3] Includes $41 million of TDRs that were modified prior to 2016 and reclassified as TDRs in the fourth quarter of 2016.