Debt - Schedule of Senior Unsecured Note Issued (Detail) (USD $)	Dec. 31, 2014	Sep. 30, 2014
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 9,940,000,000	$ 3,768,000,000
CareFusion [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	6,200,000,000
Floating Rate Notes due June 15, 2016 [Member] | CareFusion [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	750,000,000
1.800% Notes due December 15, 2017 [Member] | CareFusion [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	1,250,000,000
2.675% Notes due December 15, 2019 [Member] | CareFusion [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	1,250,000,000
3.734% Notes due December 15, 2024 [Member] | CareFusion [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	1,750,000,000
4.685% Notes due December 15, 2044 [Member] | CareFusion [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 1,200,000,000