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Long-term Incentive Compensation (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Schedule of Stock-Based Compensation Costs
The Company recognized the following amounts in total employee stock-based compensation costs for the three and six months ended June 30, 2021 and 2020:
For the three months ended June 30,For the six months ended June 30,
(in millions)2021202020212020
Stock-based compensation cost – expensed$9 $6 $22 $6 
Stock-based compensation cost – capitalized5 1 10 1 
Schedule of Equity-Classified Stock-Based Compensation Costs
The Company recognized the following amounts in employee equity-classified stock-based compensation costs for the three and six months ended June 30, 2021 and 2020:
For the three months ended June 30,For the six months ended June 30,
(in millions)2021202020212020
Equity-classified awards – expensed$2 $1 $2 $2 
Equity-classified awards – capitalized— — — — 
Summary of Equity-Classified Stock Option Activity
The following table summarizes equity-classified stock option activity for the six months ended June 30, 2021 and provides information for options outstanding and options exercisable as of June 30, 2021:
Number
of Options		Weighted Average
Exercise Price
(in thousands) 
Outstanding at December 31, 20203,850 $13.39 
Granted— $— 
Exercised— $— 
Forfeited or expired(151)$32.21 
Outstanding at June 30, 20213,699 $12.63 
Exercisable at June 30, 20213,699 $12.63 
Summary of Equity-Classified Restricted Stock Activity
The following table summarizes equity-classified restricted stock activity for the six months ended June 30, 2021 and provides information for unvested shares as of June 30, 2021:
Number
of Shares		Weighted Average
Fair Value
(in thousands) 
Unvested shares at December 31, 2020697 $5.97 
Granted307 $5.30 
Vested(855)$5.83 
Forfeited— $8.59 
Unvested shares at June 30, 2021149 $5.38 
Summary of Equity-Classified Performance Units Activity The following table summarizes equity-classified performance unit activity for the six months ended June 30, 2021 and provides information for unvested units as of June 30, 2021.
Number
of Shares		Weighted Average
Fair Value
(in thousands)
Unvested units at December 31, 2020134 $3.05 
Granted— $— 
Vested(87)$3.05 
Forfeited— $— 
Unvested units at June 30, 202147 $3.05 
Schedule of Liability-Classified Stock-Based Compensation Costs
The Company recognized the following amounts in employee liability-classified stock-based compensation costs for the three and six months ended June 30, 2021:
For the three months ended June 30,For the six months ended June 30,
(in millions)2021202020212020
Liability-classified stock-based compensation cost – expensed$7 $5 $20 $4 
Liability-classified stock-based compensation cost – capitalized5 1 10 1 
Summary of Liability-Classified Restricted Stock Unit Activity
Number
of Units		Weighted Average
Fair Value
(in thousands) 
Unvested units at December 31, 202011,613 $2.67 
Granted1,486 $4.23 
Vested(4,522)$3.40 
Forfeited(489)$4.37 
Unvested units at June 30, 20218,088 $4.90 
Summary of Liability-Classified Performance Unit Activity
Number
of Units		Weighted Average
Fair Value
(in thousands) 
Unvested units at December 31, 20208,699 $2.57 
Granted3,580 $4.14 
Vested(2,020)$4.05 
Forfeited(622)$2.98 
Unvested units at June 30, 20219,637 $3.38 
Summary of Liability-Classified Performance Unit Activity
Number
of Units		Weighted Average Fair Value
(in thousands)
Unvested units at December 31, 202018,353 $1.00 
Granted18,546 $1.00 
Vested(4,373)$1.00 
Forfeited(2,708)$1.00 
Unvested units at June 30, 202129,818 $1.00