SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	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