BUSINESS SEGMENTS INFORMATION (Revenues by Geographic Area of Customer) (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
Revenues by geographic area of customer [Line Items]
Revenues	$ 3,911	$ 3,153	$ 3,546	$ 3,792	$ 3,684	$ 4,908	$ 5,168	$ 4,868	$ 14,402	$ 18,628	$ 16,403
U.S.
Revenues by geographic area of customer [Line Items]
Revenues									5,107	5,790	5,344
Indonesia
Revenues by geographic area of customer [Line Items]
Revenues									1,894	2,226	2,023
Japan
Revenues by geographic area of customer [Line Items]
Revenues									1,181	1,946	1,882
Switzerland
Revenues by geographic area of customer [Line Items]
Revenues									2,223	2,941	1,200
China
Revenues by geographic area of customer [Line Items]
Revenues									531	873	1,136
Spain
Revenues by geographic area of customer [Line Items]
Revenues									884	1,070	1,086
India
Revenues by geographic area of customer [Line Items]
Revenues									107	389	782
PHILIPPINES
Revenues by geographic area of customer [Line Items]
Revenues									73	221	378
Korea
Revenues by geographic area of customer [Line Items]
Revenues									140	269	364
GERMANY
Revenues by geographic area of customer [Line Items]
Revenues									311	256	161
FRANCE
Revenues by geographic area of customer [Line Items]
Revenues									198	255	122
Chile
Revenues by geographic area of customer [Line Items]
Revenues									242	294	248
BELGIUM
Revenues by geographic area of customer [Line Items]
Revenues									160	278	39
BERMUDA
Revenues by geographic area of customer [Line Items]
Revenues									38	207	226
UNITED KINGDOM
Revenues by geographic area of customer [Line Items]
Revenues									233	296	226
Other
Revenues by geographic area of customer [Line Items]
Revenues									$ 1,080	$ 1,317	$ 1,186