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Asset Quality - Breakdown of Individually Impaired Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment $ 271 $ 238  
With related allowance recorded, Recorded Investment 258 209  
Recorded Investment 529 447  
With no related allowance recorded, Unpaid Principal Balance 361 311  
With related allowance recorded, Unpaid Principal Balance 284 245  
Unpaid Principal Balance 645 556  
Specific Allowance 33 19  
Average Recorded Investment 488 401 $ 428
Commercial Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 221 182  
With related allowance recorded, Recorded Investment 97 46  
With no related allowance recorded, Unpaid Principal Balance 301 245  
With related allowance recorded, Unpaid Principal Balance 97 50  
Specific Allowance 17 6  
Average Recorded Investment 273 188 219
Commercial Loans [Member] | Commercial, Financial and Agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 156 118  
With related allowance recorded, Recorded Investment 97 44  
With no related allowance recorded, Unpaid Principal Balance 224 175  
With related allowance recorded, Unpaid Principal Balance 97 47  
Specific Allowance 17 5  
Average Recorded Investment 208 149 210
Commercial Loans [Member] | Commercial Real Estate: Commercial Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 65 64  
With related allowance recorded, Recorded Investment 0 2  
With no related allowance recorded, Unpaid Principal Balance 77 70  
With related allowance recorded, Unpaid Principal Balance 0 3  
Specific Allowance 0 1  
Average Recorded Investment 65 39 9
Commercial Loans [Member] | Commercial Real Estate: Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Average Recorded Investment 0 0 0
Commercial Loans [Member] | Commercial Real Estate Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 65 64  
With related allowance recorded, Recorded Investment 0 2  
With no related allowance recorded, Unpaid Principal Balance 77 70  
With related allowance recorded, Unpaid Principal Balance 0 3  
Specific Allowance 0 1  
Average Recorded Investment 65 39 9
Consumer Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 50 56  
With related allowance recorded, Recorded Investment 161 163  
With no related allowance recorded, Unpaid Principal Balance 60 66  
With related allowance recorded, Unpaid Principal Balance 187 195  
Specific Allowance 16 13  
Average Recorded Investment 215 213 209
Consumer Loans [Member] | Home Equity Loan [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 45 49  
With related allowance recorded, Recorded Investment 81 78  
With no related allowance recorded, Unpaid Principal Balance 51 56  
With related allowance recorded, Unpaid Principal Balance 88 85  
Specific Allowance 9 8  
Average Recorded Investment 127 122 121
Consumer Loans [Member] | Real Estate - Residential Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 3 4  
With related allowance recorded, Recorded Investment 40 45  
With no related allowance recorded, Unpaid Principal Balance 4 5  
With related allowance recorded, Unpaid Principal Balance 59 70  
Specific Allowance 4 3  
Average Recorded Investment 46 49 50
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 33 34  
With no related allowance recorded, Unpaid Principal Balance 4 4  
With related allowance recorded, Unpaid Principal Balance 33 34  
Specific Allowance 3 2  
Average Recorded Investment 35 35 32
Consumer Loans [Member] | Consumer Direct Loans [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Recorded Investment 0 1  
With related allowance recorded, Recorded Investment 4 3  
With no related allowance recorded, Unpaid Principal Balance 1 1  
With related allowance recorded, Unpaid Principal Balance 4 3  
Specific Allowance 0 0  
Average Recorded Investment 4 4 3
Consumer Loans [Member] | Consumer Credit Card [Member]      
Financing Receivable, Impaired [Line Items]      
With related allowance recorded, Recorded Investment 3 3  
With related allowance recorded, Unpaid Principal Balance 3 3  
Specific Allowance 0 0  
Average Recorded Investment $ 3 $ 3 $ 3