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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Recorded Investment in Retail Loans by Delinquency Status (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans and leases | $ 119,088 | $ 116,660
Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 511 | 493
Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 212 | 177
Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 419 | 587
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 58,651 | 56,883
Total loans and leases | 61,550 | 59,877
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 18,818 | 18,664
Total loans and leases | 19,083 | 18,978
Retail | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 713 | 945
Total loans and leases | 812 | 1,073
Retail | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 11,383 | 12,042
Total loans and leases | 11,979 | 12,710
Retail | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 244 | 355
Total loans and leases | 289 | 399
Retail | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 50 | 79
Total loans and leases | 74 | 104
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 10,787 | 10,729
Total loans and leases | 12,120 | 12,106
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 10,088 | 8,694
Total loans and leases | 10,347 | 8,900
Retail | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,076 | 1,894
Total loans and leases | 2,198 | 1,991
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 4,492 | 3,481
Total loans and leases | 4,648 | 3,616
Retail | Financing Receivables, 1 to 29 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,937 | 1,955
Retail | Financing Receivables, 1 to 29 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 129 | 131
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 64 | 75
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 346 | 386
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 23 | 21
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 11 | 15
Retail | Financing Receivables, 1 to 29 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,001 | 1,039
Retail | Financing Receivables, 1 to 29 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 202 | 159
Retail | Financing Receivables, 1 to 29 Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 74 | 53
Retail | Financing Receivables, 1 to 29 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 87 | 76
Retail | Financing Receivables, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 428 | 393
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 35 | 37
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 10 | 12
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 72 | 65
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 7 | 7
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2 | 2
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 227 | 207
Retail | Financing Receivables, 30 to 59 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 30 | 23
Retail | Financing Receivables, 30 to 59 Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 15 | 14
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 30 | 26
Retail | Financing Receivables, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 184 | 142
Retail | Financing Receivables, 60 to 89 Days Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 17 | 13
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4 | 3
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 32 | 22
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3 | 3
Retail | Financing Receivables, 60 to 89 Days Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1 | 1
Retail | Financing Receivables, 60 to 89 Days Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 81 | 59
Retail | Financing Receivables, 60 to 89 Days Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 15 | 13
Retail | Financing Receivables, 60 to 89 Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 11 | 10
Retail | Financing Receivables, 60 to 89 Days Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 20 | 18
Retail | Financing Receivables, 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 350 | 504
Retail | Financing Receivables, 90 Days or More Past Due | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 84 | 133
Retail | Financing Receivables, 90 Days or More Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 21 | 38
Retail | Financing Receivables, 90 Days or More Past Due | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 146 | 195
Retail | Financing Receivables, 90 Days or More Past Due | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 12 | 13
Retail | Financing Receivables, 90 Days or More Past Due | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 10 | 7
Retail | Financing Receivables, 90 Days or More Past Due | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 24 | 72
Retail | Financing Receivables, 90 Days or More Past Due | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 12 | 11
Retail | Financing Receivables, 90 Days or More Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 22 | 20
Retail | Financing Receivables, 90 Days or More Past Due | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 19 | $ 15

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