ALLIANCES ALLIANCE (Total) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues		$ 7,945	$ 6,007	$ 6,273	$ 5,920	$ 5,973	$ 5,691	$ 5,704	$ 5,193	$ 26,145	$ 22,561	$ 20,776
Cost of Goods and Services Sold	[1]									8,078	6,467	6,014
Other Nonoperating Income (Expense)										938	(854)	(1,685)
Receivables		7,685				5,747				7,685	5,747
Accounts payable		2,445				1,892				2,445	1,892
Collaborative Arrangement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues										10,541	9,006	7,879
Cost of Goods and Services Sold										4,169	3,439	2,718
Selling, General and Administrative Expense - Collaborative Arrangement										(127)	(104)	(62)
Research and Development Expense - Collaborative Arrangement										42	1,044	(28)
Other Nonoperating Income (Expense)										(60)	(67)	(46)
Receivables		347				395				347	395
Accounts payable		1,026				904				1,026	904
Deferred income		$ 431				$ 491				431	491
Net product sales [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues										25,174	21,581	19,258
Net product sales [Member] | Collaborative Arrangement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues										9,944	8,359	6,917
Collaborative Arrangement [Member] | Collaborative Arrangement [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues										$ 597	$ 647	$ 962

[1] Excludes amortization of acquired intangible assets.