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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]
Unrecognized tax benefits, beginning balance	$ 90	$ 184	$ 261
Increases related to current year tax positions	2	1	2
Increases related to prior year tax positions	7	18	1
Decreases related to prior year tax positions	0	(45)	(1)
Settlements	0	(62)	(80)
Lapse of statute of limitations	(1)	(2)	(1)
Other, primarily due to exchange rate fluctuations affecting non-U.S. tax positions	(1)	(4)	2
Unrecognized tax benefits, ending balance	$ 97	$ 90	$ 184

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- Definition

Unrecognized Tax Benefits, Other Increase (Decrease)

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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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- Definition

Amount of unrecognized tax benefits.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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