Acquisition - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 29, 2017	Jun. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Product liability and other legal reserves	$ 1,900
Goodwill		$ 23,505	$ 7,563
CR Bard Inc
Business Acquisition [Line Items]
Cash and equivalents	1,467
Trade receivables	491
Inventories	972
Property, plant and equipment	554
Developed technology	10,469
Customer relationships	1,146
Other assets	548
Total identifiable assets acquired	15,647
Payables, accrued expenses and other liabilities	1,198
Product liability and other legal reserves	1,692
Product liability and other legal reserves	1,919
Deferred tax liabilities	1,749
Total liabilities assumed	6,559
Net identifiable assets acquired	9,089
Goodwill	15,928
Net assets acquired	$ 25,017