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DERIVATIVES - Effect of Customer Derivatives and Economic Hedges on Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Recognized in Noninterest Income | $ 57 | $ 15 | $ 100 | $ 47
Economic hedges | Foreign exchange and interest rate products | Customer interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Recognized in Noninterest Income | (84) | 12 | (363) | 92
Economic hedges | Foreign exchange and interest rate products | Customer foreign exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Recognized in Noninterest Income | 30 | 61 | (27) | 157
Economic hedges | Foreign exchange and interest rate products | Derivatives transactions to hedge interest rate risk |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Recognized in Noninterest Income | 97 | (2) | 403 | (58)
Economic hedges | Foreign exchange and interest rate products | Derivatives transactions to hedge foreign exchange risk |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Recognized in Noninterest Income | 24 | (55) | 99 | (140)
Economic hedges | Mortgage banking fees | Residential loan commitments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Recognized in Noninterest Income | 6 | 0 | 6 | 3
Economic hedges | Mortgage banking fees | Forward sale contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Recognized in Noninterest Income | (13) | (1) | (15) | (7)
Economic hedges | Mortgage banking fees | Interest rate derivative contracts used to hedge residential MSRs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amounts Recognized in Noninterest Income | $ (3) | $ 0 | $ (3) | $ 0

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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