BUSINESS SEGMENTS INFORMATION (Revenues by Geographic Area of Customer) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues by geographic area of customer [Line Items]
Revenues	$ 5,041	$ 4,310	$ 3,711	$ 3,341	$ 4,377	$ 3,877	$ 3,334	$ 3,242	$ 16,403	$ 14,830	$ 14,607
U.S.
Revenues by geographic area of customer [Line Items]
Revenues									5,344	5,896	6,842
Indonesia
Revenues by geographic area of customer [Line Items]
Revenues									2,023	1,402	1,054
Japan
Revenues by geographic area of customer [Line Items]
Revenues									1,882	1,350	1,246
Switzerland
Revenues by geographic area of customer [Line Items]
Revenues									1,200	1,147	618
China
Revenues by geographic area of customer [Line Items]
Revenues									1,136	1,125	688
Spain
Revenues by geographic area of customer [Line Items]
Revenues									1,086	878	960
India
Revenues by geographic area of customer [Line Items]
Revenues									782	553	532
PHILIPPINES
Revenues by geographic area of customer [Line Items]
Revenues									378	261	169
Korea
Revenues by geographic area of customer [Line Items]
Revenues									364	219	177
Chile
Revenues by geographic area of customer [Line Items]
Revenues									248	250	397
BERMUDA
Revenues by geographic area of customer [Line Items]
Revenues									226	273	159
UNITED KINGDOM
Revenues by geographic area of customer [Line Items]
Revenues									226	204	83
Other
Revenues by geographic area of customer [Line Items]
Revenues									$ 1,508	$ 1,272	$ 1,682