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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

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