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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance at beginning of period (in number of options/units)	53,794,235
Granted (in number of options/units)	3,861,000
Exercised (in number of options/units)	(647,941)
Expired/Forfeited (in number of options/units)	(8,992,606)
Balance at end of period (in number of options/units)	48,014,688	53,794,235
Weighted-average exercise price at beginning of period (in dollars per option)	$ 30.25
Granted, Exercise Price (in dollars per option)	15.52
Exercised, Exercise Price (in dollars per option)	7.64
Expired/Forfeited, Exercise Price (in dollars per option)	34.24
Weighted-average exercise price at end of period (in dollars per option)	$ 28.63	$ 30.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	4 years 10 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 129
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	39,725,053
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 32.26
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 62
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	$ 24
Weighted-average period used in calculating unrecognized compensation cost, stock options (in years)	2 years
Fair value assumptions and methodology [Abstract]
Weighted-average expected volatility	51.40%	71.60%	37.90%
Expected life of options (in years)	5 years 8 months 11 days	5 years 4 months 3 days	5 years 2 months 1 day
Expected dividend rate	0.00%	0.00%	4.50%
Risk free interest rate	2.00%	1.30%	1.70%
Weighted-average grant-date fair value (in dollars per option)	$ 7.61	$ 2.64	$ 4.30
Total intrinsic value of options exercised	$ 5	$ 0	$ 1
Fair value of options vested	$ 25	$ 43	$ 50
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)	716,469

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