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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

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