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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Quarterly Disclosures) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 5,041 | $ 4,310 | $ 3,711 | $ 3,341 | $ 4,377 | $ 3,877 | $ 3,334 | $ 3,242 | $ 16,403 | $ 14,830 | $ 14,607
Operating income (loss) | 1,467 | 917 | 669 | 580 | 703 | 359 | 18 | (3,872) | 3,633 | (2,792) | (13,512)
Net (loss) income from continuing operations | 1,193 | 242 | 326 | 268 | 202 | 292 | (229) | (4,097) | 2,029 | (3,832) | (12,180)
Net income (loss) from discontinued operations | 16 | 3 | 9 | 38 | (2) | (6) | (181) | (4) | 66 | (193) | 91
Net income | 1,209 | 245 | 335 | 306 | 200 | 286 | (410) | (4,101) | 2,095 | (4,025) | (12,089)
Net loss (income) and preferred dividends attributable to noncontrolling interests | (168) | 35 | (66) | (75) | 111 | (47) | (57) | (73) | (274) | (66) |
Net income from discontinued operations attributable to noncontrolling interests | 0 | 0 | (1) | (3) | (19) | (22) | (12) | (10) | (4) | (63) | (79)
Net income (loss) attributable to common stockholders | $ 1,041 | $ 280 | $ 268 | $ 228 | $ 292 | $ 217 | $ (479) | $ (4,184) | $ 1,817 | $ (4,154) | $ (12,236)
Continuing operations (in dollars per share) |  |  |  |  | $ 0.22 | $ 0.18 | $ (0.23) | $ (3.34) | $ 1.21 | $ (2.96) | $ (11.32)
Discontinued operations (in dollars per share) | $ 0.01 | $ 0.00 | $ 0.00 | $ 0.03 | (0.01) | (0.02) | (0.15) | (0.01) | 0.04 | (0.20) | 0.01
Earnings Per Share, Diluted | $ 0.71 | $ 0.19 | $ 0.18 | $ 0.16 |  |  |  |  | 1.25 |  |
Earnings per share, basic and diluted (in dollars per share) |  |  |  |  | $ 0.21 | $ 0.16 | $ (0.38) | $ (3.35) | $ 1.25 | $ (3.16) | $ (11.31)
Weighted Average Number of Shares Outstanding, Basic | 1,448,000,000 | 1,448,000,000 | 1,447,000,000 | 1,446,000,000 | 1,403,000,000 | 1,346,000,000 | 1,269,000,000 | 1,251,000,000 | 1,447,000,000 | 1,318,000,000 | 1,082,000,000
Weighted Average Number of Shares Outstanding, Diluted | 1,455,000,000.00 | 1,454,000,000.00 | 1,453,000,000.00 | 1,454,000,000.00 | 1,410,000,000 | 1,351,000,000 | 1,269,000,000 | 1,251,000,000 | 1,454,000,000.00 | 1,318,000,000 | 1,082,000,000

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