REVENUE REVENUE BY NATURE (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 11,068	$ 10,540	$ 10,129	$ 10,781	$ 7,945	$ 6,007	$ 6,273	$ 5,920	$ 42,518	$ 26,145	$ 22,561
Net product sales [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 41,321	25,174	21,581
Concentration Risk, Percentage									95.00%
Other revenues [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 582	374	333
Collaborative Arrangement [Member]
Disaggregation of Revenue [Line Items]
Revenues									9,979	10,541	9,006
Collaborative Arrangement [Member] | Net product sales [Member]
Disaggregation of Revenue [Line Items]
Revenues									9,364	9,944	8,359
Collaborative Arrangement [Member] | Collaborative Arrangement [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 615	$ 597	$ 647