Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	[1]	Sep. 30, 2017	Sep. 30, 2016	[1]
Statement of Comprehensive Income [Abstract]
Reclassification of unrealized losses on cash flow hedges from accumulated other comprehensive income to net income, tax expense	$ 0	$ 0		$ 2	$ 1
Unrealized gains (losses) on foreign currency translation, tax expense	1	0		1	1
Other comprehensive income (loss) related to equity method investee, tax (benefit) expense	$ 0	$ 1		$ 0	$ (1)

[1] Prior-period financial information has been retrospectively adjusted as discussed in Note 1.