DESCRIPTION OF BUSINESS AND ACCOUNTING POLICIES - Correction of Prior Period Amounts (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 18, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warrants outstanding	$ 47	$ 0	$ 47
Derivative and warrant fair value adjustment		12	31	$ 6
Accumulated deficit	(1,043)	(1,705)	(1,043)
Additional paid-in-capital	(2,596)	$ (3,955)	(2,596)
Revision of Prior Period, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warrants outstanding	47		47
Derivative and warrant fair value adjustment			34
Accumulated deficit	34		34
Additional paid-in-capital	81		81
Sponsor Warrants
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warrants outstanding	47		47		$ 81
Derivative and warrant fair value adjustment	34
Private Warrants | Revision of Prior Period, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Warrants outstanding	$ 47		$ 47