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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations | $ 1,193 | $ 242 | $ 326 | $ 268 | $ 202 | $ 292 | $ (229) | $ (4,097) | $ 2,029 | $ (3,832) | $ (12,180)
Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (274) | (227) | (27)
Gain on redemption and preferred dividends attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 161 | (41)
Accumulated dividends and undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  | (4) | (3) | (3)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 1,751 | (3,901) | (12,251)
Net income (loss) from discontinued operations | 16 | 3 | 9 | 38 | (2) | (6) | (181) | (4) | 66 | (193) | 91
Net income from discontinued operations attributable to noncontrolling interests | $ 0 | $ 0 | $ (1) | $ (3) | $ (19) | $ (22) | $ (12) | $ (10) | (4) | (63) | (79)
Net income (loss) from discontinued operations attributable to common stockholders |  |  |  |  |  |  |  |  | 62 | (256) | 12
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |  |  |  |  |  | $ 1,813 | $ (4,157) | $ (12,239)
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
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements |  |  |  |  |  |  |  |  | 7,000,000 | 0 | 0
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
Basic and diluted net income (loss) per share attributable to common stockholders: |  |  |  |  |  |  |  |  |  |  |
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, basic and diluted (in dollars per share) |  |  |  |  | $ 0.21 | $ 0.16 | $ (0.38) | $ (3.35) | $ 1.25 | $ (3.16) | $ (11.31)
Potential anti-dilutive securities |  |  |  |  |  |  |  |  |  | 12,000,000 | 9,000,000
Outstanding options with exercise prices greater than market price of common stock |  |  |  |  |  |  |  |  | 41,000,000 | 46,000,000 | 45,000,000

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