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DERIVATIVE FINANCIAL INSTRUMENTS - Change in Fair Values of Derivative Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealized Gains on Derivative Financial Assets | $ 222 |
Unrealized Losses on Derivative Financial Liabilities | (9) |
Net Change | 213 | $ (242)
Foreign exchange contracts |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealized Gains on Derivative Financial Assets | 182 |
Unrealized Losses on Derivative Financial Liabilities | 173 |
Net Change | 355 | (305)
Interest rates swaps and other |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealized Gains on Derivative Financial Assets | 40 |
Unrealized Losses on Derivative Financial Liabilities | (182) |
Net Change | $ (142) | $ 63

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