FINANCIAL INSTRUMENTS - Summary of Activity in Accumulated Other Comprehensive Income Related to Derivatives (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Before-Tax Amount
Accumulated derivative net losses, beginning of period	$ (5)	$ (62)
Net changes in fair value of derivatives	(21)	95
Net losses reclassified from accumulated other comprehensive income into income	(8)	5
Accumulated derivative net losses, end of period	(34)	38
Income Tax
Accumulated derivative net losses, beginning of period	(1)	8
Net changes in fair value of derivatives	(4)	(9)
Reclassification from AOCI, Current Period, Tax	0	(4)
Accumulated derivative net losses, end of period	(5)	(5)
After-Tax Amount
Accumulated derivative net losses, beginning of period	(6)	(54)
Net changes in fair value of derivatives	(25)	86
Net losses reclassified from accumulated other comprehensive income into income	(8)	1
Accumulated derivative net losses, end of period	$ (39)	$ 33

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from derivative designated and qualifying as net investment hedge.

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