BUSINESS SEGMENTS INFORMATION (Revenues by Geographic Area of Customer) (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
Revenues by geographic area of customer [Line Items]
Revenues	$ 3,684	$ 4,908	$ 5,168	$ 4,868	$ 5,041	$ 4,310	$ 3,711	$ 3,341	$ 18,628	$ 16,403	$ 14,830
U.S.
Revenues by geographic area of customer [Line Items]
Revenues									5,790	5,344	5,896
Indonesia
Revenues by geographic area of customer [Line Items]
Revenues									2,226	2,023	1,402
Japan
Revenues by geographic area of customer [Line Items]
Revenues									1,946	1,882	1,350
Switzerland
Revenues by geographic area of customer [Line Items]
Revenues									2,941	1,200	1,147
China
Revenues by geographic area of customer [Line Items]
Revenues									873	1,136	1,125
Spain
Revenues by geographic area of customer [Line Items]
Revenues									1,070	1,086	878
India
Revenues by geographic area of customer [Line Items]
Revenues									389	782	553
PHILIPPINES
Revenues by geographic area of customer [Line Items]
Revenues									221	378	261
Korea
Revenues by geographic area of customer [Line Items]
Revenues									269	364	219
GERMANY
Revenues by geographic area of customer [Line Items]
Revenues									256	161	162
FRANCE
Revenues by geographic area of customer [Line Items]
Revenues									255	122	80
Chile
Revenues by geographic area of customer [Line Items]
Revenues									294	248	250
BELGIUM
Revenues by geographic area of customer [Line Items]
Revenues									278	39	87
BERMUDA
Revenues by geographic area of customer [Line Items]
Revenues									207	226	273
UNITED KINGDOM
Revenues by geographic area of customer [Line Items]
Revenues									296	226	204
Other
Revenues by geographic area of customer [Line Items]
Revenues									$ 1,317	$ 1,186	$ 943