ALLIANCES (Otsuka) (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
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
Collaborative Arrangement [Member] | Otsuka [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaboration Distribution Fees										$ 294
Collaboration Distribution Fee Percentage		1.00%								1.00%
Cost of Goods and Services Sold										$ 302	297	299
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
Net product sales [Member] | Collaborative Arrangement [Member] | Otsuka [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenues										$ 1,794	$ 1,705	$ 1,699

[1] Excludes amortization of acquired intangible assets.