Acquisition and Equity-Method Investment - Schedule of Equity-Method Investment (Details) - GSK Consumer Healthcare [Member] $ in Millions	3 Months Ended
	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Current assets	$ 7,537
Noncurrent assets	39,509
Total assets	47,046
Current liabilities	5,576
Noncurrent liabilities	5,321
Total liabilities	10,898
Equity attributable to shareholders	36,029
Equity attributable to noncontrolling interests	120
Total net equity	36,149
Net sales	3,188
Cost of sales	(1,811)
Gross profit	1,377
Income from continuing operations	46
Net income	46
Income attributable to shareholders	$ 37