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LHFI Considered Impaired (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance $ 3,003   $ 3,003   $ 3,046
Impaired Financing Receivable, Recorded Investment [1] 2,747   2,747   2,821
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 192   192   204
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 2,780 $ 2,898 2,809 $ 2,934  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 30 31 94 94  
Commercial and Industrial [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 51   51   38
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 32   32   35
Impaired Financing Receivable, Unpaid Principal Balance 189   189   127
Impaired Financing Receivable, Recorded Investment [1] 165   165   117
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 26   26   19
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 44 70 45 81  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 0 0 1 0  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 177 150 176 145  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 0 0 3 2  
Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 21   21   0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 20   20   0
Impaired Financing Receivable, Unpaid Principal Balance 25   25   21
Impaired Financing Receivable, Recorded Investment [1] 21   21   21
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2   2   2
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 20 0 20 0  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 0 0 0 0  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 21 0 22 0  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 0 0 0 0  
Commercial Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 72   72   38
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 52   52   35
Impaired Financing Receivable, Unpaid Principal Balance 214   214   148
Impaired Financing Receivable, Recorded Investment [1] 186   186   138
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 28   28   21
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 64 70 65 81  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 0 0 1 0  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 198 150 198 145  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 0 0 3 2  
Residential Nonguaranteed [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 483   483   458
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 378   378   363
Impaired Financing Receivable, Unpaid Principal Balance 1,049   1,049   1,133
Impaired Financing Receivable, Recorded Investment [1] 1,027   1,027   1,103
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 101   101   113
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 381 364 386 361  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 4 4 11 11  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,027 1,135 1,031 1,146  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 13 14 39 45  
Home Equity Line of Credit [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 873   873   953
Impaired Financing Receivable, Recorded Investment [1] 821   821   895
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 49   49   54
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 824 890 833 901  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 9 8 27 24  
Residential Construction [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 12   12   15
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 6   6   9
Impaired Financing Receivable, Unpaid Principal Balance 83   83   93
Impaired Financing Receivable, Recorded Investment [1] 81   81   90
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 6   6   7
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 7 9 7 9  
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 80 96 82 98  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 1 2 4 4  
Consumer Other Direct [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 57   57   59
Impaired Financing Receivable, Recorded Investment [1] 57   57   59
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1   1   1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 57 58 58 59  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 1 1 3 3  
Consumer Indirect [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 131   131   123
Impaired Financing Receivable, Recorded Investment [1] 131   131   122
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 6   6   7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 134 120 141 128  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 2 2 5 4  
Credit Card Receivable [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Unpaid Principal Balance 29   29   26
Impaired Financing Receivable, Recorded Investment [1] 8   8   7
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1   1   1
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 8 6 8 6  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] 0 0 1 1  
Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 495   495   473
Impaired Financing Receivable, with No Related Allowance, Recorded Investment [1] 384   384   372
Impaired Financing Receivable, Unpaid Principal Balance 2,222   2,222   2,387
Impaired Financing Receivable, Recorded Investment [1] 2,125   2,125   2,276
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 164   164   $ 183
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 388 373 393 370  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method [2] 4 4 11 11  
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 2,130 2,305 2,153 2,338  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method [2] $ 26 $ 27 $ 79 $ 81  
[1] Carrying value 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 each of the three and nine months ended September 30, 2018 and 2017, cash basis interest income was immaterial.