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DERIVATIVES - Effect of Customer Derivatives and Economic Hedges on Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amounts Recognized in Noninterest Income |  | $ 38 | $ 22 | $ 43 | $ 32
Customer derivative contracts | Foreign Exchange and Interest Rate Products | Interest rate contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amounts Recognized in Noninterest Income | [1] | (75) | 83 | (279) | 80
Customer derivative contracts | Foreign Exchange and Interest Rate Products | Foreign exchange contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amounts Recognized in Noninterest Income | [1] | (68) | 78 | (57) | 96
Customer derivative contracts | Mortgage Banking Fees | Residential loan commitments |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amounts Recognized in Noninterest Income | [2] | 1 | (2) | 0 | 3
Economic hedges | Foreign Exchange and Interest Rate Products | Interest rate contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amounts Recognized in Noninterest Income | [1] | 90 | (71) | 306 | (56)
Economic hedges | Foreign Exchange and Interest Rate Products | Foreign exchange contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amounts Recognized in Noninterest Income | [1] | 92 | (71) | 75 | (85)
Economic hedges | Mortgage Banking Fees | Forward sale contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Amounts Recognized in Noninterest Income | [2] | $ (2) | $ 5 | $ (2) | $ (6)
[1] | Reported in foreign exchange and interest rate products on the Consolidated Statements of Operations.
[2] | Reported in mortgage banking fees on the Consolidated Statements of Operations.

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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