Debt - Schedule of Senior Unsecured Note Issued (Detail) - USD ($)	Jun. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 11,367,000,000	$ 3,768,000,000
CareFusion [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	6,200,000,000
CareFusion Corporation Debt Exchange [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	1,949,000,000
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
1.450% Senior Notes due May 15, 2017 [Member] | CareFusion Corporation Debt Exchange [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 293,000,000
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	97.64%
6.375% Senior Notes due August 1, 2019 [Member] | CareFusion Corporation Debt Exchange [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 665,000,000
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	95.00%
3.300% Senior Notes due March 1, 2023 [Member] | CareFusion Corporation Debt Exchange [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 294,000,000
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	97.95%
3.875% Senior Notes due May 15, 2024 [Member] | CareFusion Corporation Debt Exchange [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 397,000,000
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	99.37%
4.875% Senior Notes due May 15, 2044 [Member] | CareFusion Corporation Debt Exchange [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 300,000,000
Percentage of Total Outstanding Principal Amount of such Series of Existing Notes	99.96%