ALLIANCES - Financial Information Pertaining to Alliances (Total) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total Revenues		$ 45,006	$ 46,159	$ 46,385
Cost of products sold	[1]	10,693	10,137	9,940
Marketing, selling and administrative		(7,772)	(7,814)	(7,690)
Other (income)/expense, net		(1,158)	576	(720)
Receivables – from alliance partners		10,921	9,886
Accounts payable – to alliance partners		3,259	3,040
Net product sales
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total Revenues		43,778	44,671	45,055
Alliance revenues
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total Revenues		608	742	716
Alliance revenues
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total Revenues		13,151	12,743	11,556
Cost of products sold		6,067	5,768	5,227
Marketing, selling and administrative		(263)	(223)	(183)
Research and development		137	49	42
Acquired IPRD		55	100	730
Other (income)/expense, net		(49)	(53)	(62)
Receivables – from alliance partners		233	317
Accounts payable – to alliance partners		1,394	1,249
Deferred income from alliances		274	289
Alliance revenues | Net product sales
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total Revenues		12,543	12,001	10,840
Alliance revenues | Alliance revenues
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total Revenues		$ 608	$ 742	$ 716

[1] Excludes amortization of acquired intangible assets.