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DERIVATIVES - Effect of Customer Derivatives and Economic Hedges on Net Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amounts Recognized in Noninterest Income | $ 356 | $ 72
Economic hedges | Foreign exchange and interest rate products | Customer interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amounts Recognized in Noninterest Income | 1,026 | 229
Economic hedges | Foreign exchange and interest rate products | Customer foreign exchange contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amounts Recognized in Noninterest Income | (30) | (34)
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 | (1,021) | (217)
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 | 99 | 40
Economic hedges | Mortgage banking fees | Residential loan commitments |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amounts Recognized in Noninterest Income | 140 | 5
Economic hedges | Mortgage banking fees | Forward sale contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amounts Recognized in Noninterest Income | (129) | 4
Economic hedges | Mortgage banking fees | Derivative contracts used to hedge residential MSRs |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amounts Recognized in Noninterest Income | $ 271 | $ 45

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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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