Stockholders' Equity - Summary of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			$ (508)
Other comprehensive income (loss) before reclassifications			(126)
Amounts reclassified from accumulated other comprehensive income (loss)			(2)
Total before tax			(128)
Total other comprehensive income (loss), net of taxes	$ (38)	$ (87)	(128)	$ (82)
Ending balance	(636)		(636)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			2
Other comprehensive income (loss) before reclassifications			4
Amounts reclassified from accumulated other comprehensive income (loss)			(4)
Tax (expense) benefit			(1)
Total other comprehensive income (loss), net of taxes			(1)
Ending balance	1		1
Net Investment Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			1
Other comprehensive income (loss) before reclassifications			(3)
Total before tax			(3)
Tax (expense) benefit			1
Total other comprehensive income (loss), net of taxes			(2)
Ending balance	(1)		(1)
Defined Benefit Pension and Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			(77)
Amounts reclassified from accumulated other comprehensive income (loss)			2
Total before tax			2
Total other comprehensive income (loss), net of taxes			2
Ending balance	(75)		(75)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			(434)
Other comprehensive income (loss) before reclassifications			(127)
Total before tax			(127)
Total other comprehensive income (loss), net of taxes			(127)
Ending balance	$ (561)		$ (561)