Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of the period			$ (74)	$ (63)
Other comprehensive loss before reclassifications			(3)	(10)
Amounts reclassified from accumulated other comprehensive loss			3	7
Total other comprehensive (loss) income	$ (5)	$ 5	0	(3)
Balance at end of the period	(74)	(66)	(74)	(66)
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of the period			(31)	(41)
Other comprehensive loss before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive loss			3	7
Total other comprehensive (loss) income			3	7
Balance at end of the period	(28)	(34)	(28)	(34)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of the period			(41)	(20)
Other comprehensive loss before reclassifications			(3)	(10)
Amounts reclassified from accumulated other comprehensive loss			0	0
Total other comprehensive (loss) income			(3)	(10)
Balance at end of the period	(44)	(30)	(44)	(30)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of the period			(2)	(2)
Other comprehensive loss before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive loss			0	0
Total other comprehensive (loss) income			0	0
Balance at end of the period	$ (2)	$ (2)	$ (2)	$ (2)