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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Cash-settled RSUs and PSUs) (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, Non-Option Equity Instruments, Outstanding [Roll Forward]
Accounts payable and accrued liabilities	$ 2,708	$ 2,576
Cash Settled Restricted Stock Units (RSUs) and Performance Share Units (PSU's) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Balance at beginning of period (in number of RSUs and PSUs)	1,582,887
Granted in period (number of RSUs and PSUs)	879,500
Vested in Period (number of RSUs and PSUs)	(911,459)
Forfeited in Period (number of RSUs and PSUs)	(29,831)
Balance at end of period (in number of RSUs and PSUs)	1,521,097	1,582,887
Beginning Balance - weighted average grant date fair value	$ 14.54
Granted - Weighted average grant date fair value	11.96
Vested - weighted average grant date fair value	14.79
Forfeited - weighted average grant date fair value	13.44
Ending balance - weighted average grant date fair value	$ 12.92	$ 14.54
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding	$ 40
Fair value of RSUs and PSUs granted	11	$ 10	$ 16
Intrinsic value of RSUs and PSUs vested	11	8	$ 11
Other Liabilities	6	3
Accounts payable and accrued liabilities	$ 22	$ 11
Cash Settled Restricted Stock Units (RSUs) and Performance Share Units (PSU's) [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years

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