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CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Total period activity	$ (260)	$ 239	$ 72
Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(223)	(228)	(203)
Reclassification adjustments	8	21	8
Unrealized gain/(loss) on hedges	38	(16)	(33)
Total period activity	46	5	(25)
Ending balance	(177)	(223)	(228)
Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(548)	(782)	(878)
Currency translation adjustments	(305)	234	96
Total period activity	(305)	234	96
Ending balance	(853)	(548)	(782)
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1	1	0
Other	(1)		1
Total period activity	(1)	0	1
Ending balance	0	1	1
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(770)	(1,009)	(1,081)
Reclassification adjustments	8	21	8
Unrealized gain/(loss) on hedges	38	(16)	(33)
Currency translation adjustments	(305)	234	96
Other	(1)		1
Total period activity	(260)	239	72
Ending balance	$ (1,030)	$ (770)	$ (1,009)

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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