REVENUE REVENUE BY NATURE (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
Disaggregation of Revenue [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
Net product sales [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 25,174	21,581	19,258
Concentration Risk, Percentage									90.00%
Other revenues [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 374	333	556
Collaborative Arrangement [Member]
Disaggregation of Revenue [Line Items]
Revenues									10,541	9,006	7,879
Collaborative Arrangement [Member] | Net product sales [Member]
Disaggregation of Revenue [Line Items]
Revenues									9,944	8,359	6,917
Collaborative Arrangement [Member] | Collaborative Arrangement [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 597	$ 647	$ 962