ALLIANCES (Five Prime) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Alliances Statement [Line Items]
Upfront payments for licensing and alliance arrangements	$ 41	$ 15	$ 619
Contingent and regulatory milestone payments		$ 938	2,325
Five Prime [Member]
Alliances Statement [Line Items]
Upfront payments for licensing and alliance arrangements			$ 350
Contingent and regulatory milestone payments	$ 1,400