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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, 2020 | Dec. 31, 2019
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealized Gains on Derivative Financial Assets | $ 9 |
Unrealized Losses on Derivative Financial Liabilities | 0 |
Net Change | 9 | $ 10
Interest rate swaps and other |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealized Gains on Derivative Financial Assets | 9 |
Unrealized Losses on Derivative Financial Liabilities | 0 |
Net Change | $ 9 | $ 10

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