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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Recorded Investment in Commercial Loans and Leases by Regulatory Classification Ratings (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 119,088 | $ 116,660
Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 57,538 | 56,783
Commercial | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 41,479 | 40,857
Commercial | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 13,522 | 13,023
Commercial | Leases |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,537 | 2,903
Commercial | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 54,502 | 53,946
Commercial | Pass | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 38,950 | 38,600
Commercial | Pass | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 13,169 | 12,523
Commercial | Pass | Leases |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,383 | 2,823
Commercial | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,778 | 1,682
Commercial | Special Mention | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,351 | 1,231
Commercial | Special Mention | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 318 | 412
Commercial | Special Mention | Leases |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 109 | 39
Commercial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,009 | 951
Commercial | Substandard | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 934 | 828
Commercial | Substandard | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 33 | 82
Commercial | Substandard | Leases |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 42 | 41
Commercial | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 249 | 204
Commercial | Doubtful | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 244 | 198
Commercial | Doubtful | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2 | 6
Commercial | Doubtful | Leases |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 3 | $ 0

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