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DERIVATIVES - Effect of Customer Derivatives and Economic Hedges on Net Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Recognized in Noninterest Income | $ 205 | $ 66 | $ 65
Economic Hedge Type | Foreign exchange and interest rate products | Customer interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Recognized in Noninterest Income | 5 | 5 | (23)
Economic Hedge Type | Foreign exchange and interest rate products | Customer foreign exchange contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Recognized in Noninterest Income | (54) | 172 | (81)
Economic Hedge Type | Foreign exchange and interest rate products | Derivatives transactions to hedge interest rate risk |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Recognized in Noninterest Income | 43 | 46 | 70
Economic Hedge Type | Foreign exchange and interest rate products | Derivatives transactions to hedge foreign exchange risk |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Recognized in Noninterest Income | 158 | (151) | 95
Economic Hedge Type | Mortgage banking fees | Residential loan commitments |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Recognized in Noninterest Income | (3) | 2 | (2)
Economic Hedge Type | Mortgage banking fees | Forward sale contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Recognized in Noninterest Income | 21 | (8) | 6
Economic Hedge Type | Mortgage banking fees | Interest rate derivative contracts used to hedge residential MSRs |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Recognized in Noninterest Income | $ 35 | $ 0 | $ 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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