BUSINESS SEGMENTS INFORMATION (Revenues by Geographic Area of Customer) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues by geographic area of customer [Line Items]
Revenues	$ 14,198	$ 14,402	$ 18,628
U.S.
Revenues by geographic area of customer [Line Items]
Revenues	5,248	5,107	5,790
Indonesia
Revenues by geographic area of customer [Line Items]
Revenues	1,760	1,894	2,226
Japan
Revenues by geographic area of customer [Line Items]
Revenues	1,205	1,181	1,946
Switzerland
Revenues by geographic area of customer [Line Items]
Revenues	2,032	2,223	2,941
China
Revenues by geographic area of customer [Line Items]
Revenues	692	531	873
Spain
Revenues by geographic area of customer [Line Items]
Revenues	785	884	1,070
India
Revenues by geographic area of customer [Line Items]
Revenues	152	107	389
PHILIPPINES
Revenues by geographic area of customer [Line Items]
Revenues	34	73	221
Korea
Revenues by geographic area of customer [Line Items]
Revenues	89	140	269
GERMANY
Revenues by geographic area of customer [Line Items]
Revenues	248	311	256
FRANCE
Revenues by geographic area of customer [Line Items]
Revenues	153	198	255
Chile
Revenues by geographic area of customer [Line Items]
Revenues	221	242	294
BELGIUM
Revenues by geographic area of customer [Line Items]
Revenues	36	160	278
BERMUDA
Revenues by geographic area of customer [Line Items]
Revenues	0	38	207
UNITED KINGDOM
Revenues by geographic area of customer [Line Items]
Revenues	491	233	296
Other
Revenues by geographic area of customer [Line Items]
Revenues	$ 1,052	$ 1,080	$ 1,317