Accumulated Other Comprehensive Income (Loss) (AOCI) Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	$ (136)
Other comprehensive (loss) income before reclassifications	(18)
Amounts reclassified from AOCI	(4)
Accumulated other comprehensive income (loss), ending balance	(158)
Net current period other comprehensive (loss) income	(22)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	(125)
Other comprehensive (loss) income before reclassifications	(25)
Amounts reclassified from AOCI	0
Accumulated other comprehensive income (loss), ending balance	(150)
Net current period other comprehensive (loss) income	(25)
Changes in Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	(8)
Other comprehensive (loss) income before reclassifications	0
Amounts reclassified from AOCI	(3)
Accumulated other comprehensive income (loss), ending balance	(11)
Net current period other comprehensive (loss) income	(3)
Changes in Fair Value of Effective Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	(3)
Other comprehensive (loss) income before reclassifications	7
Amounts reclassified from AOCI	(1)
Accumulated other comprehensive income (loss), ending balance	3
Net current period other comprehensive (loss) income	$ 6