Derivative Instruments and Hedging Activities - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) lb	Mar. 31, 2015 USD ($)	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	$ 6,000,000		$ 6,000,000
Cash Flow Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
After-tax loss recognized in other comprehensive income (loss)	(2,000,000)	$ 0	(2,000,000)
Fair Value Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on fair value hedges	11,000,000	$ 6,000,000	24,000,000	$ 16,000,000
Forward exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	1,300,000,000		1,300,000,000		$ 2,200,000,000
Interest rate swaps | Cash Flow Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	250,000,000		250,000,000		0
Interest rate swaps | Cash Flow Hedges | CareFusion
Derivative Instruments and Hedging Activities Disclosures [Line Items]
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	$ 13,000,000		$ 13,000,000		$ 25,000,000
Total notional volume (pounds) | lb			24,000,000		49,000,000