Acquisitions, Divestitures, Equity-Method Investments, Licensing Arrangements and Collaborative Arrangements - Summarized Financial Information of Equity Method Investee (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Sep. 29, 2019	Dec. 31, 2021	Oct. 03, 2021	Dec. 31, 2020	Sep. 27, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract]
Current assets		$ 59,693		$ 35,067
Total assets		181,476		154,229
Current liabilities		42,671		25,920
Total liabilities		104,013		90,756
Total net equity/(deficit) attributable to shareholders		77,201		63,238
Equity attributable to noncontrolling interests		262		235
Total equity		77,462		63,473		$ 63,447	$ 63,758
Equity Method Investment, Summarized Financial Information [Abstract]
Income from continuing operations		22,459		6,666		10,738
Net income		22,025		9,195		16,056
Income attributable to shareholders		21,979		9,159		16,026
Consumer Healthcare JV [Member]
Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract]
Current assets			$ 6,890		$ 6,614
Noncurrent assets			39,445		38,361
Total assets			46,335		44,975
Current liabilities			5,133		5,246
Noncurrent liabilities			5,218		5,330
Total liabilities			10,351		10,576
Total net equity/(deficit) attributable to shareholders			35,705		34,154
Equity attributable to noncontrolling interests			279		245
Total equity			35,984		34,400
Equity Method Investment, Summarized Financial Information [Abstract]
Net sales	$ 2,161		12,836		12,720
Cost of sales	(803)		(4,755)		(5,439)
Gross profit	1,358		8,081		7,281
Income from continuing operations	152		1,614		1,350
Net income	152		1,614		1,350
Income attributable to shareholders	$ 148		$ 1,547		$ 1,307
ViiV [Member] | ViiV [Member]
Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract]
Current assets		3,608		3,283
Noncurrent assets		3,563		3,381
Total assets		7,171		6,664
Current liabilities		3,497		3,028
Noncurrent liabilities		6,536		6,370
Total liabilities		10,033		9,398
Total net equity/(deficit) attributable to shareholders		(2,862)		(2,734)
Equity Method Investment, Summarized Financial Information [Abstract]
Net sales		6,380		6,224		6,139
Cost of sales		(682)		(574)		(516)
Gross profit		5,698		5,650		5,623
Income from continuing operations		2,040		2,012		3,398
Net income		2,040		2,012		3,398
Income attributable to shareholders		$ 2,040		$ 2,012		$ 3,398