Acquisition - Fair Value of Company's Ordinary Shares Issued (Details) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
	Dec. 29, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Fair value of the Company’s issued shares		$ 8,004	$ 0
CR Bard Inc
Business Acquisition [Line Items]
Total Bard shares outstanding (in shares)	73,359,000
Conversion factor (in shares)	0.5077
Conversion of Bard shares outstanding (in shares)	37,243,000
Conversion of share-based compensation units (in shares)	104,000
Total number of the Company's share issued (in shares)	37,347,000
Closing price of the Company’s stock (in dollars per share)	$ 214.32
Fair value of the Company’s issued shares	$ 8,004