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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (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 at beginning of period	$ 29	$ 27	$ 28
Additions related to acquisitions	13	0	0
Additions for prior year tax positions	1	6	13
Reductions to prior period tax positions	0	(2)	0
Lapse of statute of limitations	(3)	0	(2)
Settlements	(2)	(4)	(12)
Foreign currency translation, increase		2
Foreign currency translation, decrease	(1)		0
Balance at end of period	$ 37	$ 29	$ 27

X

- Definition

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

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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