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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Compensation [Abstract]  
Schedule of Stock-Based Compensation Costs
The Company recognized the following amounts in total employee stock-based compensation costs for the three and nine months ended September 30, 2019 and 2018:
For the three months ended September 30,For the nine months ended September 30,
(in millions)2019201820192018
Stock-based compensation cost – expensed$1  $7  $12  $20  
Stock-based compensation cost – capitalized1  3  7  10  
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 nine months ended September 30, 2019 and 2018:
For the three months ended September 30,For the nine months ended September 30,
(in millions)2019201820192018
Equity-classified awards – expensed$2  $3  $6  $12  
Equity-classified awards – capitalized1  2  3  6  
Summary of Equity-Classified Stock Option Activity
The following table summarizes equity-classified stock option activity for the nine months ended September 30, 2019 and provides information for options outstanding and options exercisable as of September 30, 2019:
Number
of Options		Weighted Average
Exercise Price
(in thousands) 
Outstanding at December 31, 20185,178  $17.06  
Granted—  $—  
Exercised—  $—  
Forfeited or expired(76) $19.38  
Outstanding at September 30, 20195,102  $17.02  
Exercisable at September 30, 20194,680  $17.85  
Summary of Equity-Classified Restricted Stock Activity
The following table summarizes equity-classified restricted stock activity for the nine months ended September 30, 2019 and provides information for unvested shares as of September 30, 2019:
Number
of Shares		Weighted Average
Fair Value
(in thousands) 
Unvested shares at December 31, 20182,717  $7.91  
Granted477  $3.09  
Vested(1,101) $7.02  
Forfeited(210) $8.38  
Unvested shares at September 30, 20191,883  $7.17  
Summary of Equity-Classified Performance Units Activity
The following table summarizes equity-classified performance unit activity for the nine months ended September 30, 2019 and provides information for unvested units as of September 30, 2019.  The performance unit awards granted in 2017 include a market condition based exclusively on the fair value of the Total Shareholder Return (“TSR”), as calculated by a Monte Carlo model.  The total fair value of the performance units is amortized to compensation expense on a straight line basis over the vesting period of the award.  The grant date fair value is calculated using the closing price of the Company’s common stock at the grant date.

Number
of Shares (1)
Weighted Average
Fair Value
(in thousands) 
Unvested units at December 31, 2018598  $10.01  
Granted—  $—  
Vested(371) $9.73  
Forfeited(30) $10.47  
Unvested units at September 30, 2019197  $10.47  
(1)The actual payout of shares may range from a minimum of zero shares to a maximum of two shares per unit contingent upon TSR.  The performance units have a three-year vesting term and the actual disbursement of shares, if any, is determined during the first quarter following the end of the three-year vesting period.
Schedule of Liability-Classified Stock-Based Compensation Costs
The Company recognized the following amounts in employee liability-classified stock-based compensation costs for the three and nine months ended September 30, 2019:
For the three months ended September 30,For the nine months ended September 30,
(in millions)2019201820192018
Liability-classified stock-based compensation cost – expensed$(1) $4  $6  $8  
Liability-classified stock-based compensation cost – capitalized—  1  4  4  
Summary of Liability-Classified Restricted Stock Unit Activity As of September 30, 2019, there was $22 million of total unrecognized compensation cost related to liability-classified restricted stock units that is expected to be recognized over a weighted-average period of 3.0 years. The amount of unrecognized compensation cost for liability-classified awards will fluctuate over time as they are marked to market.
Number
of Units		Weighted Average
Fair Value
(in thousands) 
Unvested shares at December 31, 20188,202  $3.41  
Granted8,659  $4.34  
Vested(2,624) $4.09  
Forfeited(1,000) $2.51  
Unvested units at September 30, 201913,237  $1.93  
Summary of Liability-Classified Performance Unit Activity
Number
of Shares		Weighted Average
Fair Value
(in thousands) 
Unvested shares at December 31, 20182,803  $3.41  
Granted2,757  $4.34  
Vested—  $—  
Forfeited(119) $4.65  
Unvested units at September 30, 20195,441  $1.93