SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Net (loss) income from continuing operations	$ 42	$ (235)	$ (74)	$ 75	$ 374	$ 668	$ 1,039	$ 828	$ (192)	$ 2,909	$ 2,029
Net income from continuing operations attributable to noncontrolling interests									(50)	(292)	(274)
Accumulated dividends and undistributed earnings allocated to participating securities									(3)	(4)	(4)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent									(245)	2,613	1,751
Net income (loss) from discontinued operations	$ 1	$ 1	$ 0	$ 1	$ 4	$ (4)	$ (4)	$ (11)	3	(15)	66
Net income from discontinued operations attributable to noncontrolling interests									0	0	(4)
Net income (loss) from discontinued operations attributable to common stockholders									3	(15)	62
Net Income (Loss) Available to Common Stockholders, Diluted									$ (242)	$ 2,598	$ 1,813
Weighted Average Number of Shares Outstanding, Basic	1,452,000,000	1,452,000,000	1,451,000,000	1,451,000,000	1,450,000,000	1,450,000,000	1,449,000,000	1,449,000,000	1,451,000,000	1,449,000,000	1,447,000,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements									0	9,000,000	7,000,000
Weighted Average Number of Shares Outstanding, Diluted	1,457,000,000	1,452,000,000	1,451,000,000	1,457,000,000	1,457,000,000	1,458,000,000	1,458,000,000	1,458,000,000	1,451,000,000	1,458,000,000	1,454,000,000
Basic net income (loss) per share attributable to common stockholders:
Income (Loss) from Continuing Operations, Per Basic Share					$ 0.33	$ 0.38	$ 0.60	$ 0.48	$ (0.17)	$ 1.80	$ 1.21
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share									0	(0.01)	0.04
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share					0	0	0	(0.01)		(0.01)
Earnings per share, basic (in dollars per share)	$ 0	$ (0.15)	$ (0.05)	$ 0.02	0.33	0.38	0.60	0.47	(0.17)	1.79	1.25
Diluted net income (loss) per share attributable to common stockholders:
Income (Loss) from Continuing Operations, Per Diluted Share					0.33	0.38	0.59	0.48	(0.17)	1.79	1.21
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share					0	0	0	(0.01)	0	(0.01)	0.04
Earnings Per Share, Diluted	$ 0	$ (0.15)	$ (0.05)	$ 0.02	$ 0.33	$ 0.38	$ 0.59	$ 0.47	$ (0.17)	$ 1.78	$ 1.25
Potential anti-dilutive securities									11,000,000	1,000,000
Outstanding options with exercise prices greater than market price of common stock									42,000,000	37,000,000	41,000,000