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Income Taxes - Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, Beginning		$ 15	$ 14	$ 24
Additions related to current year		3	0	1
Additions related to prior years positions		5	0	0
Reductions related to prior years positions		0	0	(5)
Settlements with taxing authorities	[1]	(1)	0	(5)
Currency		(2)		(1)
Currency			1
Balance, Ending		20	15	14
Cash paid as result of settlement		1		5
unrecognized tax benefits, other uncertain tax positions offsetting benefits from other jurisdictions		15	16	16
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		$ 10	$ 6	$ 4
[1] 2018 and 2016 settlement resulted in $1 million and $5 million cash paid, respectively

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unrecognized tax benefits, other uncertain tax positions offsetting benefits from other jurisdictions

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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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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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