Acquisition Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Millions		6 Months Ended
	Dec. 29, 2017	Mar. 31, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Goodwill		$ 23,491	$ 7,563
CR Bard Inc [Member]
Business Acquisition [Line Items]
Cash and equivalents	$ 1,467
Trade receivables	491
Inventories	975
Property, plant and equipment	554
Developed technology	10,403
Customer relationships	1,124
Other assets	542
Total identifiable assets acquired	15,555
Payables, accrued expenses and other liabilities	1,142
Product liability reserves	1,692
Product liability reserves	1,634
Deferred tax liabilities	1,947
Total liabilities assumed	6,416
Net identifiable assets acquired	9,139
Goodwill	15,877
Net assets acquired	$ 25,017	$ 25,017