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Asset Quality - Aging Analysis of Past Due and Current Loans (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 93,197 | $ 88,011
Total Past Due and Non-performing Loans | 1,003 | 966
Non-performing Loans | 577 | 542
Purchased Credit Impaired | 446 | 575
Total Loans | 94,646 | 89,552
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 228 | 218
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 101 | 94
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 97 | 112
Commercial Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 67,224 | 65,558
Total Past Due and Non-performing Loans | 635 | 511
Non-performing Loans | 355 | 244
Purchased Credit Impaired | 173 | 241
Total Loans | 68,032 | 66,310
Commercial Loans [Member] | Commercial, Financial and Agricultural [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 47,768 | 45,375
Total Past Due and Non-performing Loans | 479 | 317
Non-performing Loans | 264 | 152
Purchased Credit Impaired | 48 | 61
Total Loans | 48,295 | 45,753
Commercial Loans [Member] | Commercial Real Estate: Commercial Mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 13,258 | 13,957
Total Past Due and Non-performing Loans | 109 | 150
Non-performing Loans | 83 | 81
Purchased Credit Impaired | 124 | 178
Total Loans | 13,491 | 14,285
Commercial Loans [Member] | Commercial Real Estate Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,551 | 1,646
Total Past Due and Non-performing Loans | 6 | 18
Non-performing Loans | 2 | 2
Purchased Credit Impaired | 1 | 2
Total Loans | 1,558 | 1,666
Commercial Loans [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 14,809 | 15,603
Total Past Due and Non-performing Loans | 115 | 168
Non-performing Loans | 85 | 83
Purchased Credit Impaired | 125 | 180
Total Loans | 15,049 | 15,951
Commercial Loans [Member] | Commercial Lease Financing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 4,647 | 4,580
Total Past Due and Non-performing Loans | 41 | 26
Non-performing Loans | 6 | 9
Purchased Credit Impaired | 0 | 0
Total Loans | 4,688 | 4,606
Commercial Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 143 | 128
Commercial Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial, Financial and Agricultural [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 110 | 89
Commercial Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate: Commercial Mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 8 | 27
Commercial Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 3 | 0
Commercial Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 11 | 27
Commercial Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Lease Financing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 22 | 12
Commercial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 68 | 62
Commercial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial, Financial and Agricultural [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 52 | 31
Commercial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate: Commercial Mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 5 | 17
Commercial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 0 | 13
Commercial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 5 | 30
Commercial Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Lease Financing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 11 | 1
Commercial Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 69 | 77
Commercial Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial, Financial and Agricultural [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 53 | 45
Commercial Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate: Commercial Mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 13 | 25
Commercial Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Construction [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 1 | 3
Commercial Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 14 | 28
Commercial Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Lease Financing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 2 | 4
Consumer Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 25,973 | 22,453
Total Past Due and Non-performing Loans | 368 | 455
Non-performing Loans | 222 | 298
Purchased Credit Impaired | 273 | 334
Total Loans | 26,614 | 23,242
Consumer Loans [Member] | Real Estate - Residential Mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 6,705 | 5,119
Total Past Due and Non-performing Loans | 61 | 80
Non-performing Loans | 48 | 62
Purchased Credit Impaired | 257 | 314
Total Loans | 7,023 | 5,513
Consumer Loans [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 10,071 | 10,862
Total Past Due and Non-performing Loans | 190 | 263
Non-performing Loans | 145 | 210
Purchased Credit Impaired | 13 | 17
Total Loans | 10,274 | 11,142
Consumer Loans [Member] | Consumer Direct Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 3,484 | 1,780
Total Past Due and Non-performing Loans | 26 | 26
Non-performing Loans | 4 | 4
Purchased Credit Impaired | 3 | 3
Total Loans | 3,513 | 1,809
Consumer Loans [Member] | Credit Card Receivable [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,104 | 1,119
Total Past Due and Non-performing Loans | 26 | 25
Non-performing Loans | 3 | 2
Purchased Credit Impaired | 0 | 0
Total Loans | 1,130 | 1,144
Consumer Loans [Member] | Consumer Indirect Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 4,609 | 3,573
Total Past Due and Non-performing Loans | 65 | 61
Non-performing Loans | 22 | 20
Purchased Credit Impaired | 0 | 0
Total Loans | 4,674 | 3,634
Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 85 | 90
Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate - Residential Mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 7 | 11
Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 30 | 31
Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Direct Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 10 | 11
Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Credit Card Receivable [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 6 | 6
Consumer Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Indirect Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 32 | 31
Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 33 | 32
Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate - Residential Mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 5 | 3
Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 10 | 12
Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Direct Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 5 | 5
Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Credit Card Receivable [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 5 | 5
Consumer Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Indirect Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 8 | 7
Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 28 | 35
Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate - Residential Mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 1 | 4
Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity Loan [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 5 | 10
Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Direct Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 7 | 6
Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Credit Card Receivable [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | 12 | 12
Consumer Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Indirect Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due and Non-performing Loans | $ 3 | $ 3

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