Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2014	Sep. 30, 2014	Dec. 14, 2014
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
Fixed to Floating Interest Rate Swaps Agreements [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	375,000,000	375,000,000			375,000,000
Interest rate	3.125%	3.125%
Interest rate swap agreement conversion description		The outstanding swaps represent fixed-to-floating interest rate swap agreements the Company entered into, in March and September 2014, to convert the interest payments on $375 million of the Company's 3.125% notes, due November 8, 2021, from the fixed rate to a floating interest rate based on LIBOR.
Financial instruments related to hedges, maturity date		Nov. 08, 2021
Gain recorded on fair value hedges	6,000,000	16,000,000
Offsetting loss recorded on underlying debt	6,000,000	16,000,000
Commodity Forward Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	0	0			0
Forward Exchange Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	2,600,000,000	2,600,000,000			1,800,000,000
Interest Rate Swaps [Member] | CareFusion [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount						2,300,000,000
Interest Rate Swaps [Member] | Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	0	0			0
Interest Rate Swaps [Member] | Cash Flow Hedges [Member] | CareFusion [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss recognized in other comprehensive income (loss)	$ 0	$ (8,000,000)	$ 0	$ 0