Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income Loss (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014		Mar. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			$ (61)
Other comprehensive loss	2	(14)	(6)	[1]	(12)
Amounts reclassified from accumulated other comprehensive income
Ending balance	(67)		(67)
Foreign Currency Translation Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			(57)
Other comprehensive loss			(6)	[1]
Amounts reclassified from accumulated other comprehensive income
Ending balance	(63)		(63)
Minimum Pension Liability Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			(4)
Amounts reclassified from accumulated other comprehensive income
Ending balance	(4)		(4)
Deferred Gains (Losses) on Derivative Financial Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Amounts reclassified from accumulated other comprehensive income

[1] Foreign currency translation adjustments include a gain on intra-entity foreign currency transactions that are of a long-term investment nature of $2 million.