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EARNINGS PER SHARE - Calculation of EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Basic EPS calculation    
Net loss $ (1,745) $ (44)
Net income attributable to noncontrolling interests (51) (23)
NET LOSS ATTRIBUTABLE TO COMMON STOCK (1,796) (67)
Net loss attributable to common stockholders $ (1,796) $ (67)
Weighted-average common shares outstanding — basic 49.3 48.7
Basic (in dollars per share) $ (36.43) $ (1.38)
Diluted EPS calculation    
Net loss $ (1,745) $ (44)
Net income attributable to noncontrolling interests (51) (23)
NET LOSS ATTRIBUTABLE TO COMMON STOCK (1,796) (67)
Net loss attributable to common stockholders $ (1,796) $ (67)
Weighted-average common shares outstanding — basic 49.3 48.7
Dilutive effect of potentially dilutive securities (in shares) 0.0 0.0
Weighted-average common shares outstanding — diluted 49.3 48.7
Diluted (in dollars per share) $ (36.43) $ (1.38)
Weighted-average anti-dilutive shares 4.6 2.5