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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 689
Other comprehensive (loss) income	(76)	$ 11	$ 30
Ending Balance	813	689
Net Investment Hedge [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(10)	(25)	(40)
Other comprehensive (loss) income	(66)	15	15
Ending Balance	(76)	(10)	(25)
Cash Flow Hedge [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	2	6	0
Other comprehensive (loss) income	(10)	(4)	6
Ending Balance	(8)	2	6
Currency Translation Adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(231)	(233)	(158)
Other comprehensive (loss) income	111	2	(75)
Ending Balance	(120)	(231)	(233)
Defined Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(110)	(312)	(244)
Other comprehensive (loss) income	4	202	(68)
Ending Balance	(106)	(110)	(312)
Accumulated Other Comprehensive (Loss) Income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(349)	(564)	(442)
Other comprehensive (loss) income	39	215	(122)
Ending Balance	$ (310)	$ (349)	$ (564)

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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