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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Stock Option and SARs) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance at beginning of period (in number of options/units)	49,303,879
Granted (in number of options/units)	7,167,000
Exercised (in number of options/units)	(14,750)
Expired/Forfeited (in number of options/units)	(2,661,894)
Balance at end of period (in number of options/units)	53,794,235	49,303,879
Weighted-average exercise price at beginning of period (in dollars per option)	$ 34.10
Granted, Exercise Price (in dollars per option)	4.35
Exercised, Exercise Price (in dollars per option)	12.12
Expired/Forfeited, Exercise Price (in dollars per option)	31.80
Weighted-average exercise price at end of period (in dollars per option)	$ 30.25	$ 34.10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	4 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 66
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	44,314,195
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 34.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 14
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Annual vesting percentage	25.00%
Total unrecognized compensation cost related to unvested options expected to be recognized over a weighted-average period	$ 19
Weighted-average period used in calculating unrecognized compensation cost, stock options (in years)	1 year 11 months
Fair value assumptions and methodology [Abstract]
Weighted-average expected volatility	71.60%	37.90%	36.60%
Expected life of options (in years)	5 years 4 months 3 days	5 years 2 months 1 day	4 years 11 months 1 day
Expected dividend rate	0.00%	4.50%	3.50%
Risk free interest rate	1.30%	1.70%	1.70%
Weighted-average grant-date fair value (in dollars per option)	$ 2.64	$ 4.30	$ 7.43
Total intrinsic value of options exercised	$ 0	$ 1	$ 17
Fair value of options vested	$ 43	$ 50	$ 76
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	5 years
Annual vesting percentage			33.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance at end of period (in number of options/units)	1,034,153

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