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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, 2017 | Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealized Gains on Derivative Financial Assets | $ 132 |
Unrealized Losses on Derivative Financial Liabilities | (374) |
Net Change | (242) | $ 112
Foreign exchange contracts |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealized Gains on Derivative Financial Assets | 0 |
Unrealized Losses on Derivative Financial Liabilities | (305) |
Net Change | (305) | 97
Interest rates swaps and other |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealized Gains on Derivative Financial Assets | 132 |
Unrealized Losses on Derivative Financial Liabilities | (69) |
Net Change | $ 63 | $ 15

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