Segment Data - Financial Information for Company's Segments Footnote (Detail) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jan. 15, 2015	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Lease Contract Modification Related Charge			$ 748	$ 0	$ 0
Corporate and All Other | Care Fusion Corporation
Segment Reporting Information [Line Items]
Inventory step-up adjustment					$ 293
RTI Technologies
Segment Reporting Information [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	$ 12	$ (336)	$ (336)