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Long-Term Incentive Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Equity-Classified Stock-Based Compensation Costs
The Company recorded the following costs related to long-term incentive compensation for the years ended December 31, 2023, 2022 and 2021:
(in millions)202320222021
Long-term incentive compensation – expensed$23 $30 $30 
Long-term incentive compensation – capitalized$15 $20 $18 
The Company recognized the following amounts in employee equity-classified stock-based compensation costs for the years ended December 31, 2023, 2022 and 2021:
(in millions)202320222021
Equity-classified awards – expensed$9 $4 $2 
Equity-classified awards – capitalized$3 $3 $— 
The Company recorded the following compensation costs related to equity-classified restricted stock grants for the years ended December 31, 2023, 2022 and 2021:
(in millions)202320222021
Restricted stock grants – general and administrative expense$2 $1 $2 
Restricted stock grants – capitalized expense$— $— $— 
The Company recorded the following compensation costs related to equity-classified restricted stock units for the years ended December 31, 2023, 2022 and 2021:
(in millions)202320222021
Restricted stock units – general and administrative expense$5 $2 $— 
Restricted stock units – capitalized expense$2 $2 $— 
(in millions)202320222021
Performance units – general and administrative expense$2 $1 $— 
Performance units – capitalized expense$1 $1 $— 
The Company recognized the following amounts in employee liability-classified stock-based compensation costs for the years ended December 31, 2023, 2022 and 2021:
(in millions)202320222021
Liability-classified stock-based compensation – expensed$5 $20 $24 
Liability-classified stock-based compensation awards – capitalized$2 $11 $14 
The Company recorded the following compensation costs related to performance cash awards for the years ended December 31, 2023, 2022 and 2021:
(in millions)202320222021
Performance cash awards – general and administrative expense$9 $6 $4 
Performance cash awards – capitalized expense$10 $6 $4 
Summary of Equity-Classified Stock Option Activity
The following tables summarize stock option activity for the years 2023, 2022 and 2021, and provide information for options outstanding at December 31 of each year:
202320222021
Number
of Shares		Weighted Average Exercise Price
Number
of Shares
Weighted Average Exercise Price
Number
of Shares
Weighted Average Exercise Price
(in thousands) (in thousands) (in thousands) 
Options outstanding at January 1997 $8.59 3,006 $8.98 3,850 $13.39 
Granted— $— — $— — $— 
Exercised— $— (893)$7.80 — $— 
Forfeited or expired(177)$8.60 (1,116)$10.26 (844)$29.10 
Options outstanding at December 31820 $8.59 997 $8.59 3,006 $8.98 
Options exercisable at December 31 (1)
820 $8.59 
(1)Weighted average remaining contractual life for options outstanding and exercisable was 1.1 years, as of December 31, 2023.
Summary of Equity-Classified Restricted Stock Activity
The following table summarizes the restricted stock activity for the years 2023, 2022 and 2021, and provides information for restricted stock outstanding at December 31 of each year:
202320222021
Number of
Shares		Weighted Average Fair Value
Number of
Shares
Weighted Average Fair Value
Number of
Shares
Weighted Average Fair Value
(in thousands) (in thousands) (in thousands) 
Unvested shares at January 1211 $5.81 242 $5.12 697 $5.97 
Granted336 $5.34 231 $6.92 438 $5.18 
Vested(378)$5.71 (262)$6.15 (893)$5.81 
Forfeited— $— — $— — $8.59 
Unvested shares at December 31169 $5.09 211 $5.81 242 $5.12 
The following table summarizes equity-classified restricted stock unit activity to be paid out in Company stock for the years ended December 31, 2023, 2022 and 2021.
202320222021
Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value		Number
of Shares		Weighted Average
Fair Value
(in thousands)(in thousands)(in thousands)
Unvested Units at January 11,645 $4.44 37 $3.05 134 $3.05 
Granted1,617 $4.94 1,699 $4.45 — $— 
Vested(555)$4.42 (22)$3.05 (92)$3.05 
Forfeited(1)$3.05 (69)$4.37 (5)$3.05 
Unvested Units at December 312,706 $4.74 1,645 $4.44 37 $3.05 
Summary of Equity-Classified Performance Units Activity
The following table summarizes equity-classified performance unit activity to be paid out in Company stock for the years ended December 31, 2023, 2022 and 2021, and provides information for unvested units as of December 31, 2023, 2022 and 2021:
202320222021
Number of
Units (1)
Weighted
Average Fair Value
Number of
Units (1)
Weighted
Average Fair Value		Number of
Units		Weighted
Average Fair Value
(in thousands)(in thousands)(in thousands)
Unvested units at January 1817 $6.04 — $— — $— 
Granted940 $6.12 850 $6.04 — $— 
Vested— $— — $— — $— 
Forfeited— $— (33)

$6.04 — $— 
Unvested shares at December 311,757 $6.08 817 $6.04 — $— 
Schedule of Liability-Classified Stock-Based Compensation Costs
The Company recorded the following compensation costs related to liability-classified restricted stock unit grants for the years ended December 31, 2023, 2022 and 2021:
(in millions)202320222021
Restricted stock units – general and administrative expense$4 $9 $12 
Restricted stock units – capitalized expense$2 $6 $8 
The Company recorded the following compensation costs related to liability-classified performance unit grants for the years ended December 31, 2023, 2022 and 2021:
(in millions)202320222021
Liability-classified performance units – general and administrative expense$1 $11 $12 
Liability-classified performance units – capitalized expense$— $5 $6 
Summary of Liability-Classified Restricted Stock Unit Activity
The following table summarizes restricted stock unit activity to be paid out in cash or Company stock for the years ended December 31, 2023, 2022 and 2021 and provides information for unvested units as of December 31, 2023, 2022 and 2021:
202320222021
Number
of Units		Weighted Average Fair ValueNumber
of Units		Weighted Average Fair ValueNumber
of Units		Weighted Average Fair Value
(in thousands) (in thousands)(in thousands)
Unvested units at January 13,950 $4.81 7,937 $4.08 11,613 $2.67 
Granted— $— — $— 1,486 $4.23 
Vested(2,206)$4.84 (3,817)$4.48 (4,522)$3.40 
Forfeited(3)$5.57 (170)$6.83 (640)
(1)
$4.56 
Unvested units at December 311,741 $4.67 3,950 $4.81 7,937 $4.08 
(1)Includes 360,253 units related to the reduction in workforce for the year ended December 31, 2021.
Summary of Liability-Classified Performance Unit Activity
The following table summarizes liability-classified performance unit activity to be paid out in cash or stock for the years ended December 31, 2023, 2022 and 2021 and provides information for unvested units as of December 31, 2023, 2022 and 2021:
202320222021
Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value
(in thousands) (in thousands)(in thousands)
Unvested units at January 110,982 $2.25 9,515 $2.88 8,699 $2.57 
Granted5,136 $4.83 3,798 $1.00 3,580 $4.14 
Vested(3,966)$6.13 (1,910)$6.45 (2,020)$4.05 
Forfeited— $— (421)$6.70 (744)$3.40 
Unvested units at December 3112,152 $0.94 10,982 $2.25 9,515 $2.88 
Share-based Compensation, Liability-based Restricted Cash Units Nonvested Activity
The following table summarizes performance cash award activity to be paid out in cash for the years ended December 31, 2023, 2022 and 2021 and provides information for unvested units as of December 31, 2023, 2022 and 2021:
202320222021
Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value		Number
of Shares		Weighted Average
Fair Value
(in thousands)(in thousands)
Unvested units at January 139,994 $1.00 28,272 $1.00 18,353 $1.00 
Granted27,493 $1.00 24,416 $1.00 18,546 $1.00 
Vested(13,320)$1.00 (8,786)$1.00 (4,955)$1.00 
Forfeited(4,489)$1.00 (3,908)$1.00 (3,672)
(1)
$1.00 
Unvested Units at December 3149,678 $1.00 39,994 $1.00 28,272 $1.00 
(1) Includes 1,241,000 units related to the reduction in workforce for the year ended December 31, 2021.