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Consolidated Statement of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comprehensive Income (Loss) [Abstract]
Net income	$ 569	$ 189	$ 1,140
Changes in fair value of derivative instruments, net of reclassifications into earnings, net of tax benefit (expense) of $(1), $2, and $8 in 2019, 2018, and 2017, respectively	5	(3)	(13)
Total other comprehensive income (loss)	5	(3)	(13)
COMPREHENSIVE INCOME	$ 574	$ 186	$ 1,127

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Comprehensive Income (Loss) [Abstract]

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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