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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 117,880 | $ 116,660
Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 56,733 | 56,783
Commercial | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 53,900 | 53,946
Commercial | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,705 | 1,682
Commercial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 846 | 951
Commercial | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 282 | 204
Commercial | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 41,356 | 40,857
Commercial | Commercial | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 38,997 | 38,600
Commercial | Commercial | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,369 | 1,231
Commercial | Commercial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 761 | 828
Commercial | Commercial | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 229 | 198
Commercial | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 12,820 | 13,023
Commercial | Commercial real estate | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 12,437 | 12,523
Commercial | Commercial real estate | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 297 | 412
Commercial | Commercial real estate | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 36 | 82
Commercial | Commercial real estate | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 50 | 6
Commercial | Leases |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,557 | 2,903
Commercial | Leases | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 2,466 | 2,823
Commercial | Leases | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 39 | 39
Commercial | Leases | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 49 | 41
Commercial | Leases | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 3 | $ 0

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