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EARNINGS PER SHARE - Calculation of EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic EPS calculation        
Net income (loss) $ 91 $ (132) $ 37 $ (127)
Net income attributable to noncontrolling interests (25) (1) (55) (1)
Net income (loss) attributable to common stock 66 (133) (18) (128)
Less: net income allocated to participating securities (1) 0 0 0
Net income (loss) available to common stockholders $ 65 $ (133) $ (18) $ (128)
Weighed-average common shares outstanding - basic 48.5 42.7 47.0 42.5
Basic EPS (in dollars per share) $ 1.34 $ (3.11) $ (0.38) $ (3.01)
Diluted EPS calculation        
Net income (loss) $ 91 $ (132) $ 37 $ (127)
Net income attributable to noncontrolling interests (25) (1) (55) (1)
Net income (loss) attributable to common stock 66 (133) (18) (128)
Less: net income allocated to participating securities (1) 0 0 0
Net (loss) income available to common stockholders $ 65 $ (133) $ (18) $ (128)
Weighed-average common shares outstanding - basic 48.5 42.7 47.0 42.5
Dilutive effect of potentially dilutive securities 0.6      
Weighted-average common shares outstanding - diluted 49.1 42.7 47.0 42.5
Diluted EPS (in dollars per share) $ 1.32 $ (3.11) $ (0.38) $ (3.01)
Weighted-average anti-dilutive shares 1.1 2.5 2.8 2.6