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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 37	$ 29	$ 27
Additions related to acquisitions	0	13	0
Additions for prior year tax positions	20	1	6
Reductions to prior period tax positions	0	0	(2)
Lapse of statute of limitations	(1)	(3)	0
Settlements	(15)	(2)	(4)
Foreign currency translation, decrease	0	(1)
Foreign currency translation			2
Balance at end of period	$ 41	$ 37	$ 29

X

- Definition

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

+ References

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Amount of unrecognized tax benefits.

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

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