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Asset Quality - Breakdown of Individually Impaired Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment $ 238 $ 213  
With related allowance recorded, Recorded Investment 209 141  
Recorded Investment 447 354  
With no related allowance recorded, Unpaid Principal Balance 311 246  
With related allowance recorded, Unpaid Principal Balance 245 159  
Unpaid Principal Balance 556 405  
Specific Allowance 19 23  
Average Recorded Investment 401 428 $ 405
Commercial Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 182 138  
With related allowance recorded, Recorded Investment 46 10  
With no related allowance recorded, Unpaid Principal Balance 245 171  
With related allowance recorded, Unpaid Principal Balance 50 28  
Specific Allowance 6 6  
Average Recorded Investment 188 219 187
Commercial Loans [Member] | Commercial, Financial and Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 118 126  
With related allowance recorded, Recorded Investment 44 10  
With no related allowance recorded, Unpaid Principal Balance 175 153  
With related allowance recorded, Unpaid Principal Balance 47 28  
Specific Allowance 5 6  
Average Recorded Investment 149 210 176
Commercial Loans [Member] | Commercial Real Estate: Commercial Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 64 12  
With related allowance recorded, Recorded Investment 2 0  
With no related allowance recorded, Unpaid Principal Balance 70 18  
With related allowance recorded, Unpaid Principal Balance 3 0  
Specific Allowance 1 0  
Average Recorded Investment 39 9 8
Commercial Loans [Member] | Commercial Real Estate: Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 0 0 3
Commercial Loans [Member] | Commercial Real Estate Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 64 12  
With related allowance recorded, Recorded Investment 2 0  
With no related allowance recorded, Unpaid Principal Balance 70 18  
With related allowance recorded, Unpaid Principal Balance 3 0  
Specific Allowance 1 0  
Average Recorded Investment 39 9 11
Consumer Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 56 75  
With related allowance recorded, Recorded Investment 163 131  
With no related allowance recorded, Unpaid Principal Balance 66 75  
With related allowance recorded, Unpaid Principal Balance 195 131  
Specific Allowance 13 17  
Average Recorded Investment 213 209 218
Consumer Loans [Member] | Home Equity Loan [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 49 56  
With related allowance recorded, Recorded Investment 78 61  
With no related allowance recorded, Unpaid Principal Balance 56 56  
With related allowance recorded, Unpaid Principal Balance 85 61  
Specific Allowance 8 9  
Average Recorded Investment 122 121 125
Consumer Loans [Member] | Real Estate - Residential Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 4 17  
With related allowance recorded, Recorded Investment 45 32  
With no related allowance recorded, Unpaid Principal Balance 5 17  
With related allowance recorded, Unpaid Principal Balance 70 32  
Specific Allowance 3 5  
Average Recorded Investment 49 50 53
Consumer Loans [Member] | Consumer Indirect Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 2 2  
With related allowance recorded, Recorded Investment 34 32  
With no related allowance recorded, Unpaid Principal Balance 4 2  
With related allowance recorded, Unpaid Principal Balance 34 32  
Specific Allowance 2 3  
Average Recorded Investment 35 32 34
Consumer Loans [Member] | Consumer Direct Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 1 0  
With related allowance recorded, Recorded Investment 3 4  
With no related allowance recorded, Unpaid Principal Balance 1 0  
With related allowance recorded, Unpaid Principal Balance 3 4  
Specific Allowance 0 0  
Average Recorded Investment 4 3 3
Consumer Loans [Member] | Consumer Credit Card [Member]      
Financing Receivable, Impaired [Line Items]      
With related allowance recorded, Recorded Investment 3 2  
With related allowance recorded, Unpaid Principal Balance 3 2  
Specific Allowance 0 0  
Average Recorded Investment $ 3 $ 3 $ 3