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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of share based compensation expense
As shown in the table below, we recognized the following stock-based compensation expense during the Predecessor periods. No stock-based compensation was recognized during the Successor period.

 Predecessor
January 1, 2020 - October 31, 2020Years ended
December 31,
(in millions) 20192018
Stock-based compensation expense$3 $32 $45 
Payments of cash-based portion of awards$8 $25 $24 
Summary of changes in cash and stock-settled Restricted Stock Units (RSUs)
The following summarizes our RSU activity for 2020:
Stock-SettledCash-Settled
Number of Units Weighted-Average Grant-Date Fair ValueNumber of Units
(in thousands)(in thousands)
Unvested at December 31, 2019 (Predecessor)554 $17.54 2,285 
Granted633 $6.20 4,327 
Vested (357)$16.40 (1,062)
Cancelled or Forfeited(830)$9.37 (5,550)
Unvested at October 31, 2020 (Predecessor)— $— — 
Summary of changes in cash and stock-settled Performance Stock Units (PSUs)
The following summarizes our PSU activity for 2020:
Stock-SettledCash-Settled
Number of AwardsWeighted-Average Grant-Date Fair ValueNumber of Units
(in thousands)(in thousands)
Unvested at December 31, 2019 (Predecessor)497 $19.75 401 
Granted792 $6.20 792 
Cancelled or Forfeited(1,289)$11.43 (1,193)
Unvested at October 31, 2020 (Predecessor)— $— — 
Summary of stock option activity
The following table summarizes our option activity during 2020:
OptionsWeighted-Average Exercise PriceWeighted-Average Grant-Date Fair ValueAggregate Intrinsic Value
(in thousands)
Balance at December 31, 2019 (Predecessor)1,427 $59.00 $16.81 $— 
Granted593 $6.82 $3.31 $— 
Cancelled or Forfeited(2,020)$43.68 $12.84 $— 
Balance at October 31, 2020 (Predecessor)— $— $— $—