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Asset Quality - Breakdown of Individually Impaired Loans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment $ 212   $ 212   $ 213
With related allowance recorded, Recorded Investment 210   210   141
Recorded Investment 422   422   354
With no related allowance recorded, Unpaid Principal Balance 266   266   246
With related allowance recorded, Unpaid Principal Balance 266   266   159
Unpaid Principal Balance 532   532   405
Specific Allowance 24   24   23
Average Recorded Investment 409 $ 428 388 $ 445  
Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 143   143   138
With related allowance recorded, Recorded Investment 64   64   10
With no related allowance recorded, Unpaid Principal Balance 179   179   171
With related allowance recorded, Unpaid Principal Balance 94   94   28
Specific Allowance 7   7   6
Average Recorded Investment 194 216 177 235  
Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 69   69   75
With related allowance recorded, Recorded Investment 146   146   131
With no related allowance recorded, Unpaid Principal Balance 87   87   75
With related allowance recorded, Unpaid Principal Balance 172   172   131
Specific Allowance 17   17   17
Average Recorded Investment 215 212 211 210  
Commercial and Industrial [Member] | Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 123   123   126
With related allowance recorded, Recorded Investment 64   64   10
With no related allowance recorded, Unpaid Principal Balance 154   154   153
With related allowance recorded, Unpaid Principal Balance 94   94   28
Specific Allowance 7   7   6
Average Recorded Investment 178 201 161 225  
Commercial Real Estate: Commercial Mortgage [Member] | Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 20   20   12
With no related allowance recorded, Unpaid Principal Balance 25   25   18
Average Recorded Investment 16 15 16 10  
Commercial Real Estate: Construction [Member] | Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
Average Recorded Investment 0 0 0 0  
Commercial Real Estate Loans [Member] | Commercial Loans [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 20   20   12
With no related allowance recorded, Unpaid Principal Balance 25   25   18
Average Recorded Investment 16 15 16 10  
Real Estate - Residential Mortgage [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 16   16   17
With related allowance recorded, Recorded Investment 32   32   32
With no related allowance recorded, Unpaid Principal Balance 24   24   17
With related allowance recorded, Unpaid Principal Balance 52   52   32
Specific Allowance 4   4   5
Average Recorded Investment 49 50 49 50  
Home Equity Loans [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 51   51   56
With related allowance recorded, Recorded Investment 74   74   61
With no related allowance recorded, Unpaid Principal Balance 59   59   56
With related allowance recorded, Unpaid Principal Balance 80   80   61
Specific Allowance 10   10   9
Average Recorded Investment 124 122 121 122  
Consumer Indirect Loans [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With no related allowance recorded, Recorded Investment 2   2   2
With related allowance recorded, Recorded Investment 33   33   32
With no related allowance recorded, Unpaid Principal Balance 4   4   2
With related allowance recorded, Unpaid Principal Balance 33   33   32
Specific Allowance 3   3   3
Average Recorded Investment 35 34 34 32  
Consumer Direct Loans [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Impaired [Line Items]          
With related allowance recorded, Recorded Investment 4   4   4
With related allowance recorded, Unpaid Principal Balance 4   4   4
Specific Allowance 0   0   0
Average Recorded Investment 4 3 4 3  
Credit Cards [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   2
Specific Allowance 0   0   $ 0
Average Recorded Investment $ 3 $ 3 $ 3 $ 3