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LHFI Considered Impaired (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance $ 3,132   $ 3,132   $ 3,434
Impaired Financing Receivable, Recorded Investment [1] 2,894   2,894   3,068
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 226   226   255
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 2,898 $ 3,124 2,934 $ 3,079  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 31 29 94 92  
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 79   79   266
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 72   72   214
Impaired Financing Receivable, Unpaid Principal Balance 171   171   225
Impaired Financing Receivable, Recorded Investment [1] 153   153   151
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 30   30   31
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 70 268 81 200  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 0 1 0 1  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 150 188 145 185  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 0 0 2 1  
Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 0   0   26
Impaired Financing Receivable, Recorded Investment [1] 0   0   17
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0   2
Commercial Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 79   79   266
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 72   72   214
Impaired Financing Receivable, Unpaid Principal Balance 171   171   251
Impaired Financing Receivable, Recorded Investment [1] 153   153   168
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 30   30   33
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 70 268 81 200  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 0 1 0 1  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 150 188 145 185  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 0 0 2 1  
Residential Nonguaranteed [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 461   461   466
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 365   365   360
Impaired Financing Receivable, Unpaid Principal Balance 1,161   1,161   1,277
Impaired Financing Receivable, Recorded Investment [1] 1,132   1,132   1,248
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 124   124   150
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 364 364 361 368  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 4 4 11 12  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,135 1,288 1,146 1,292  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 14 15 45 48  
Home Equity Line of Credit [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 945   945   863
Impaired Financing Receivable, Recorded Investment [1] 885   885   795
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 55   55   54
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 890 771 901 780  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 8 7 24 22  
Residential Construction [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 16   16   16
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 9   9   8
Impaired Financing Receivable, Unpaid Principal Balance 97   97   109
Impaired Financing Receivable, Recorded Investment [1] 96   96   107
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 8   8   11
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 9 8 9 8  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 0 0 0 0  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 96 112 98 114  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 2 1 4 4  
Residential Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 477   477   482
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 374   374   368
Impaired Financing Receivable, Unpaid Principal Balance 2,203   2,203   2,249
Impaired Financing Receivable, Recorded Investment [1] 2,113   2,113   2,150
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 187   187   215
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 373 372 370 376  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 4 4 11 12  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 2,121 2,171 2,145 2,186  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 24 23 73 74  
Consumer Other Direct [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 59   59   59
Impaired Financing Receivable, Recorded Investment [1] 59   59   59
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1   1   1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 58 10 59 11  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 1 0 3 0  
Consumer Indirect [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 118   118   103
Impaired Financing Receivable, Recorded Investment [1] 117   117   103
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 7   7   5
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 120 109 128 115  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 2 1 4 4  
Credit Card Receivable [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 25   25   24
Impaired Financing Receivable, Recorded Investment [1] 6   6   6
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1   1   1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 6 6 6 6  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 0 0 1 0  
Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 202   202   186
Impaired Financing Receivable, Recorded Investment [1] 182   182   168
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 9   9   $ 7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 184 125 193 132  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] $ 3 $ 1 $ 8 $ 4  
[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 and nine months ended September 30, 2017, cash basis interest income was less than $1 million and $3 million, respectively.Of the interest income recognized during the three and nine months ended September 30, 2016, cash basis interest income was less than $1 million and $2 million, respectively