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Asset Quality - Breakdown of Individually Impaired Loans (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment $ 205   $ 205   $ 306
With related allowance recorded, Recorded Investment 184   184   195
Recorded Investment 389   389   501
With no related allowance recorded, Unpaid Principal Balance 230   230   386
With related allowance recorded, Unpaid Principal Balance 197   197   207
Unpaid Principal Balance 427   427   593
Specific Allowance 37   37   38
Average Recorded Investment 428 $ 589 445 $ 440  
Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 125   125   224
With related allowance recorded, Recorded Investment 56   56   66
With no related allowance recorded, Unpaid Principal Balance 150   150   304
With related allowance recorded, Unpaid Principal Balance 69   69   77
Specific Allowance 20   20   17
Average Recorded Investment 216 362 235 216  
Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 80   80   82
With related allowance recorded, Recorded Investment 128   128   129
With no related allowance recorded, Unpaid Principal Balance 80   80   82
With related allowance recorded, Unpaid Principal Balance 128   128   130
Specific Allowance 17   17   21
Average Recorded Investment 212 227 210 224  
Commercial and Industrial [Member] | Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 124   124   222
With related allowance recorded, Recorded Investment 42   42   62
With no related allowance recorded, Unpaid Principal Balance 138   138   301
With related allowance recorded, Unpaid Principal Balance 54   54   73
Specific Allowance 17   17   17
Average Recorded Investment 201 342 225 195  
Commercial Real Estate: Commercial Mortgage [Member] | Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 1   1   2
With related allowance recorded, Recorded Investment 14   14   4
With no related allowance recorded, Unpaid Principal Balance 12   12   3
With related allowance recorded, Unpaid Principal Balance 15   15   4
Specific Allowance 3   3   0
Average Recorded Investment 15 6 10 8  
Commercial Real Estate: Construction [Member] | Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Average Recorded Investment 0 14 0 13  
Commercial Real Estate Loans [Member] | Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 1   1   2
With related allowance recorded, Recorded Investment 14   14   4
With no related allowance recorded, Unpaid Principal Balance 12   12   3
With related allowance recorded, Unpaid Principal Balance 15   15   4
Specific Allowance 3   3   0
Average Recorded Investment 15 20 10 21  
Real Estate - Residential Mortgage [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 19   19   20
With related allowance recorded, Recorded Investment 31   31   31
With no related allowance recorded, Unpaid Principal Balance 19   19   20
With related allowance recorded, Unpaid Principal Balance 31   31   31
Specific Allowance 3   3   2
Average Recorded Investment 50 54 50 54  
Home Equity Loans [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 59   59   61
With related allowance recorded, Recorded Investment 60   60   64
With no related allowance recorded, Unpaid Principal Balance 59   59   61
With related allowance recorded, Unpaid Principal Balance 60   60   64
Specific Allowance 13   13   18
Average Recorded Investment 122 132 122 128  
Consumer Indirect Loans [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 2   2   1
With related allowance recorded, Recorded Investment 31   31   29
With no related allowance recorded, Unpaid Principal Balance 2   2   1
With related allowance recorded, Unpaid Principal Balance 31   31   29
Specific Allowance 1   1   1
Average Recorded Investment 34 35 32 37  
Consumer Direct Loans [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With related allowance recorded, Recorded Investment 3   3   2
With related allowance recorded, Unpaid Principal Balance 3   3   3
Specific Allowance 0   0   0
Average Recorded Investment 3 3 3 2  
Credit Cards [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With related allowance recorded, Recorded Investment 3   3   3
With related allowance recorded, Unpaid Principal Balance 3   3   3
Specific Allowance 0   0   $ 0
Average Recorded Investment $ 3 $ 3 $ 3 $ 3