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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, 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)