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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	33.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance at beginning of period (in number of options/units)	48,312,053
Granted (in number of options/units)	3,803,000
Exercised (in number of options/units)	(6,240,340)
Expired/Forfeited (in number of options/units)	(8,774,615)
Balance at end of period (in number of options/units)	37,100,098	48,312,053
Weighted-average exercise price at beginning of period (in dollars per option)	$ 26.16
Granted, Exercise Price (in dollars per option)	12.04
Exercised, Exercise Price (in dollars per option)	9.09
Expired/Forfeited, Exercise Price (in dollars per option)	34.62
Weighted-average exercise price at end of period (in dollars per option)	$ 25.58	$ 26.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	4 years 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 259
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	30,045,828
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 28.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 162
Share-based Payment Arrangement, 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	$ 14
Weighted-average period used in calculating unrecognized compensation cost, stock options (in years)	1 year 2 months 12 days
Fair value assumptions and methodology [Abstract]
Weighted-average expected volatility	47.70%	47.80%	46.10%
Expected life of options (in years)	5 years 9 months 29 days	6 years 1 month 6 days	5 years 11 months 1 day
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.70%	1.80%	1.20%
Risk free interest rate	1.50%	2.50%	2.60%
Weighted-average grant-date fair value (in dollars per option)	$ 4.72	$ 4.87	$ 7.84
Total intrinsic value of options exercised	$ 82	$ 3	$ 7
Fair value of options vested	$ 28	$ 26	$ 24

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