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Asset Quality - Breakdown of Allowance for Loan and Lease Losses and Corresponding Loan Balances (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance, Total ALLL - Including Discontinued Operations | $ 35 | $ 21
Collectively Evaluated for Impairment Allowance, Total ALLL - Including Discontinued Operations | 869 | 871
Purchased Credit Impaired Allowance, Total ALLL - Including Discontinued Operations | 6 | 5
Loans Outstanding, Total ALLL - Including Discontinued Operations | 95,511 | 90,625
Individually Evaluated for Impairment Outstanding, Total ALLL - Including Discontinued Operations | 552 | 470
Collectively Evaluated for Impairment Outstanding, Total ALLL - Including Discontinued Operations | 94,513 | 89,580
Purchased Credit Impaired Outstanding, Total ALLL - Including Discontinued Operations | 446 | 575
Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 33 | 19
Collectively Evaluated for Impairment Allowance | 861 | 859
Purchase Credit Impairment Allowance | 6 | 5
Loans Outstanding | 94,646 | 89,552
Individually Evaluated for Impairment Outstanding | 529 | 447
Collectively Evaluated for Impairment Outstanding | 93,671 | 88,530
Purchase Credit Impairment Outstanding | 446 | 575
Discontinued Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 2 | 2
Collectively Evaluated for Impairment Allowance | 8 | 12
Purchase Credit Impairment Allowance | 0 | 0
Loans Outstanding | 865 | 1,073
Individually Evaluated for Impairment Outstanding | 23 | 23
Collectively Evaluated for Impairment Outstanding | 842 | 1,050
Purchase Credit Impairment Outstanding | 0 | 0
Loans carried at fair value | 2 |
Commercial Loans [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 17 | 5
Collectively Evaluated for Impairment Allowance | 731 | 734
Purchase Credit Impairment Allowance | 3 | 4
Loans Outstanding | 68,032 | 66,310
Individually Evaluated for Impairment Outstanding | 318 | 228
Collectively Evaluated for Impairment Outstanding | 67,541 | 65,841
Purchase Credit Impairment Outstanding | 173 | 241
Commercial Loans [Member] | Commercial, Financial and Agricultural [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 17 | 5
Collectively Evaluated for Impairment Allowance | 533 | 526
Purchase Credit Impairment Allowance | 1 | 1
Loans Outstanding | 48,295 | 45,753
Individually Evaluated for Impairment Outstanding | 253 | 162
Collectively Evaluated for Impairment Outstanding | 47,994 | 45,530
Purchase Credit Impairment Outstanding | 48 | 61
Commercial Loans [Member] | Commercial Real Estate: Commercial Mortgage [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 0 | 0
Collectively Evaluated for Impairment Allowance | 141 | 139
Purchase Credit Impairment Allowance | 2 | 3
Loans Outstanding | 13,491 | 14,285
Individually Evaluated for Impairment Outstanding | 65 | 66
Collectively Evaluated for Impairment Outstanding | 13,302 | 14,041
Purchase Credit Impairment Outstanding | 124 | 178
Commercial Loans [Member] | Commercial Real Estate: Construction [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 0 | 0
Collectively Evaluated for Impairment Allowance | 22 | 33
Purchase Credit Impairment Allowance | 0 | 0
Loans Outstanding | 1,558 | 1,666
Individually Evaluated for Impairment Outstanding | 0 | 0
Collectively Evaluated for Impairment Outstanding | 1,557 | 1,664
Purchase Credit Impairment Outstanding | 1 | 2
Commercial Loans [Member] | Commercial Real Estate Loans [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 0 | 0
Collectively Evaluated for Impairment Allowance | 163 | 172
Purchase Credit Impairment Allowance | 2 | 3
Loans Outstanding | 15,049 | 15,951
Individually Evaluated for Impairment Outstanding | 65 | 66
Collectively Evaluated for Impairment Outstanding | 14,859 | 15,705
Purchase Credit Impairment Outstanding | 125 | 180
Commercial Loans [Member] | Commercial Lease Financing [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 0 | 0
Collectively Evaluated for Impairment Allowance | 35 | 36
Purchase Credit Impairment Allowance | 0 | 0
Loans Outstanding | 4,688 | 4,606
Individually Evaluated for Impairment Outstanding | 0 | 0
Collectively Evaluated for Impairment Outstanding | 4,688 | 4,606
Purchase Credit Impairment Outstanding | 0 | 0
Consumer Loans [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 16 | 14
Collectively Evaluated for Impairment Allowance | 130 | 125
Purchase Credit Impairment Allowance | 3 | 1
Loans Outstanding | 26,614 | 23,242
Individually Evaluated for Impairment Outstanding | 211 | 219
Collectively Evaluated for Impairment Outstanding | 26,130 | 22,689
Purchase Credit Impairment Outstanding | 273 | 334
Consumer Loans [Member] | Real Estate - Residential Mortgage [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 4 | 3
Collectively Evaluated for Impairment Allowance | 1 | 4
Purchase Credit Impairment Allowance | 2 | 0
Loans Outstanding | 7,023 | 5,513
Individually Evaluated for Impairment Outstanding | 43 | 49
Collectively Evaluated for Impairment Outstanding | 6,723 | 5,150
Purchase Credit Impairment Outstanding | 257 | 314
Consumer Loans [Member] | Home Equity Loan [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 9 | 8
Collectively Evaluated for Impairment Allowance | 21 | 26
Purchase Credit Impairment Allowance | 1 | 1
Loans Outstanding | 10,274 | 11,142
Individually Evaluated for Impairment Outstanding | 126 | 127
Collectively Evaluated for Impairment Outstanding | 10,135 | 10,998
Purchase Credit Impairment Outstanding | 13 | 17
Consumer Loans [Member] | Consumer Direct Loans [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 0 | 0
Collectively Evaluated for Impairment Allowance | 34 | 30
Purchase Credit Impairment Allowance | 0 | 0
Loans Outstanding | 3,513 | 1,809
Individually Evaluated for Impairment Outstanding | 4 | 4
Collectively Evaluated for Impairment Outstanding | 3,506 | 1,802
Purchase Credit Impairment Outstanding | 3 | 3
Consumer Loans [Member] | Credit Card Receivable [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 0 | 0
Collectively Evaluated for Impairment Allowance | 47 | 48
Purchase Credit Impairment Allowance | 0 | 0
Loans Outstanding | 1,130 | 1,144
Individually Evaluated for Impairment Outstanding | 3 | 3
Collectively Evaluated for Impairment Outstanding | 1,127 | 1,141
Purchase Credit Impairment Outstanding | 0 | 0
Consumer Loans [Member] | Consumer Indirect Loans [Member] | Continuing Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Individually Evaluated for Impairment Allowance | 3 | 3
Collectively Evaluated for Impairment Allowance | 27 | 17
Purchase Credit Impairment Allowance | 0 | 0
Loans Outstanding | 4,674 | 3,634
Individually Evaluated for Impairment Outstanding | 35 | 36
Collectively Evaluated for Impairment Outstanding | 4,639 | 3,598
Purchase Credit Impairment Outstanding | 0 | 0
Education Lending [Member] | Discontinued Operations [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Loans carried at fair value | $ 2 | $ 2

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