Derivative Instruments and Hedging Activities - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) lb	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) lb
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Reclassification of terminated interest rate swaps to interest expense within the next 12 months	$ 5,000,000		$ 5,000,000
After-tax loss recognized in other comprehensive income (loss)	(10,000,000)	$ (4,000,000)	(12,000,000)	$ (12,000,000)
Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gains (losses) on fair value hedges	3,000,000	$ (7,000,000)	9,000,000	9,000,000
Forward exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	1,400,000,000		1,400,000,000		$ 2,200,000,000
Interest rate swaps | Cash Flow Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	500,000,000		500,000,000		0
After-tax loss recognized in other comprehensive income (loss)				$ (8,000,000)
Fixed to Floating
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount					375,000,000
Fixed to Floating | Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 375,000,000		$ 375,000,000
Debt instrument, interest rate	3.125%		3.125%
Commodity forward contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 6,000,000		$ 6,000,000		$ 25,000,000
Total notional volume (pounds) | lb			12,000,000		49,000,000