Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (338)
Other comprehensive income before reclassifications			(49)
Amounts reclassified from accumulated other comprehensive income			1
Total before tax	(36)	(49)	(48)	(10)
Tax (expense) benefit
Net current year other comprehensive income	(35)	(49)	(48)	(10)
Ending balance	(386)		(386)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(1)
Other comprehensive income before reclassifications			1
Amounts reclassified from accumulated other comprehensive income
Total before tax			1
Tax (expense) benefit
Net current year other comprehensive income			1
Ending balance
Defined benefit pension and postretirement benefit plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(86)
Other comprehensive income before reclassifications
Amounts reclassified from accumulated other comprehensive income			1
Total before tax			1
Tax (expense) benefit
Net current year other comprehensive income			1
Ending balance	(85)		(85)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(251)
Other comprehensive income before reclassifications			(50)
Amounts reclassified from accumulated other comprehensive income
Total before tax			(50)
Tax (expense) benefit
Net current year other comprehensive income			(50)
Ending balance	$ (301)		$ (301)