ALLIANCES (Ono) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Alliances Statement [Line Items]
Net product sales									$ 19,258	$ 17,702	$ 14,045
Alliance revenues									1,518	1,725	2,515
Total Revenues	$ 5,449	$ 5,254	$ 5,144	$ 4,929	$ 5,243	$ 4,922	$ 4,871	$ 4,391	20,776	19,427	16,560
Upfront payments for licensing and alliance arrangements									$ 41	15	619
Contingent and regulatory milestone payments					$ 938					938	2,325
Ono [Member]
Alliances Statement [Line Items]
Profit sharing involving only one compound - maximum									80.00%
Profit sharing involving only one compound - minimum									20.00%
Co-promotion fee percentage									60.00%
Net product sales									$ 145	147	113
Alliance revenues									268	280	61
Total Revenues									413	$ 427	$ 174
Upfront payments for licensing and alliance arrangements									40
Contingent and regulatory milestone payments	$ 480								$ 480
North America [Member] | Ono [Member]
Alliances Statement [Line Items]
Royalty rate due to regulatory approvals									4.00%
Rest of World Except Japan, South Korea and Taiwan [Member] | Ono [Member]
Alliances Statement [Line Items]
Royalty rate due to regulatory approvals									15.00%