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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Quarterly Disclosures) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 4,377 | $ 3,877 | $ 3,334 | $ 3,242 | $ 3,516 | $ 3,382 | $ 3,938 | $ 3,771 | $ 14,830 | $ 14,607 | $ 20,001
Operating income (loss) | 703 | 359 | 18 | (3,872) | (4,097) | (3,964) | (2,421) | (3,030) | (2,792) | (13,512) | (298)
Net (loss) income from continuing operations | 202 | 292 | (229) | (4,097) | (4,090) | (3,815) | (1,828) | (2,447) | (3,832) | (12,180) | (1,022)
Net (loss) income from discontinued operations | (2) | (6) | (181) | (4) | (4) | 25 | 29 | 41 | (193) | 91 | 277
Net (loss) income | 200 | 286 | (410) | (4,101) | (4,094) | (3,790) | (1,799) | (2,406) | (4,025) | (12,089) | (745)
Net loss (income) and preferred dividends attributable to noncontrolling interests | 111 | (47) | (57) | (73) | 24 | (24) | (26) | (42) | (66) | (68) |
Net income from discontinued operations attributable to noncontrolling interests | (19) | (22) | (12) | (10) | (11) | (16) | (26) | (26) | (63) | (79) | (165)
Net (loss) income attributable to common stockholders | $ 292 | $ 217 | $ (479) | $ (4,184) | $ (4,081) | $ (3,830) | $ (1,851) | $ (2,474) | $ (4,154) | $ (12,236) | $ (1,308)
Continuing operations (in dollars per share) | $ 0.22 | $ 0.18 | $ (0.23) | $ (3.34) | $ (3.46) | $ (3.59) | $ (1.78) | $ (2.40) | $ (2.96) | $ (11.32) | $ (1.37)
Discontinued operations (in dollars per share) | (0.01) | (0.02) | (0.15) | (0.01) | (0.01) | 0.01 | 0.00 | 0.02 | (0.20) | 0.01 | 0.11
Earnings per share, basic and diluted (in dollars per share) | $ 0.21 | $ 0.16 | $ (0.38) | $ (3.35) | $ (3.47) | $ (3.58) | $ (1.78) | $ (2.38) | $ (3.16) | $ (11.31) | $ (1.26)

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