Acquisitions - Fair Value of Assets and Liabilities Assumed (Detail) - USD ($) $ in Millions	Mar. 17, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Goodwill		$ 7,537	$ 1,090	$ 1,109
Care Fusion Corporation
Business Acquisition [Line Items]
Cash and equivalents	$ 1,903
Trade receivables, net	530
Inventories	813
Net investment in sales-type leases	1,208
Property, plant and equipment	499
Customer relationships	3,360
Developed technology	2,510
Trademarks	380
Other intangible assets	185
Other assets	321
Total identifiable assets acquired	11,709
Long-term debt	(2,181)
Deferred tax liabilities	(2,034)
Other liabilities	(1,299)
Total liabilities assumed	(5,514)
Net identifiable assets acquired	6,195
Goodwill	6,343
Net assets acquired	$ 12,538