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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 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 117,615 | $ 116,660
Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 57,689 | 56,783
Commercial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 54,919 | 53,946
Commercial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,588 | 1,682
Commercial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 967 | 951
Commercial | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 215 | 204
Commercial | Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 41,497 | 40,857
Commercial | Commercial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 39,296 | 38,600
Commercial | Commercial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,096 | 1,231
Commercial | Commercial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 892 | 828
Commercial | Commercial | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 213 | 198
Commercial | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 13,372 | 13,023
Commercial | Commercial real estate | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 12,953 | 12,523
Commercial | Commercial real estate | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 381 | 412
Commercial | Commercial real estate | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 36 | 82
Commercial | Commercial real estate | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2 | 6
Commercial | Leases |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,820 | 2,903
Commercial | Leases | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,670 | 2,823
Commercial | Leases | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 111 | 39
Commercial | Leases | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 39 | 41
Commercial | Leases | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 0 | $ 0

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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