REVENUE REVENUE BY NATURE (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 5,973	$ 5,691	$ 5,704	$ 5,193	$ 5,449	$ 5,254	$ 5,144	$ 4,929	$ 22,561	$ 20,776	$ 19,427
Sales Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 21,581	19,258	17,702
Concentration Risk, Percentage									90.00%
Other Income [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 333	556	473
Collaborative Arrangement [Member]
Disaggregation of Revenue [Line Items]
Revenues									9,006	7,879	6,782
Collaborative Arrangement [Member] | Sales Revenue, Net [Member]
Disaggregation of Revenue [Line Items]
Revenues									8,359	6,917	5,530
Collaborative Arrangement [Member] | Collaborative Arrangement [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 647	$ 962	$ 1,252