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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2019 and 2018:

For the three months ended March 31,
(in millions)
2019
 
2018
Stock-based compensation cost – expensed
$
7

 
$
5

Stock-based compensation cost – capitalized
4

 
3
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 months ended March 31, 2019 and 2018:

For the three months ended March 31,
(in millions)
2019
 
2018
Equity-classified awards – expensed
$
2

 
$
4

Equity-classified awards – capitalized
1

 
3
Summary of Equity-Classified Stock Option Activity The following table summarizes equity-classified stock option activity for the three months ended March 31, 2019 and provides information for options outstanding and options exercisable as of March 31, 2019:

Number
of Options
 
Weighted Average
Exercise Price

(in thousands)
 
 
Outstanding at December 31, 2018
5,178

 
$
17.06

Granted
—

 
$
—

Exercised
—

 
$
—

Forfeited or expired
(58
)
 
$
15.74

Outstanding at March 31, 2019
5,120

 
$
17.07

Exercisable at March 31, 2019
4,604

 
$
18.16
Summary of Equity-Classified Restricted Stock Activity The following table summarizes equity-classified restricted stock activity for the three months ended March 31, 2019 and provides information for unvested shares as of March 31, 2019:

Number
of Shares
 
Weighted Average
Fair Value

(in thousands)
 
 
Unvested shares at December 31, 2018
2,717

 
$
7.91

Granted
9

 
$
3.72

Vested
(608
)
 
$
8.74

Forfeited
(145
)
 
$
8.38

Unvested shares at March 31, 2019
1,973

 
$
7.61
Summary of Equity-Classified Performance Units Activity The following table summarizes equity-classified performance unit activity for the three months ended March 31, 2019 and provides information for unvested units as of March 31, 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, 2018
598

 
$
10.01

Granted
—

 
$
—

Vested
(371
)
 
$
9.73

Forfeited
(30
)
 
$
10.47

Unvested units at March 31, 2019
197

 
$
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 months ended March 31, 2019:

For the three months ended March 31,
(in millions)
2019
 
2018
Liability-classified stock-based compensation cost – expensed
$
5

 
$
1

Liability-classified stock-based compensation cost – capitalized
3

 
—
Summary of Liability-Classified Restricted Stock Unit Activity As of March 31, 2019, there was $61 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 three years.

Number
of Units
 
Weighted Average
Fair Value

(in thousands)
 
 
Unvested shares at December 31, 2018
8,202

 
$
3.41

Granted
8,659

 
$
4.34

Vested
(2,120
)
 
$
4.29

Forfeited
(504
)
 
$
3.85

Unvested units at March 31, 2019
14,237

 
$
4.69
Summary of Liability-Classified Performance Unit Activity

Number
of Shares
 
Weighted Average
Fair Value

(in thousands)
 
 
Unvested shares at December 31, 2018
2,803

 
$
3.41

Granted
2,757

 
$
4.34

Vested
—

 
$
—

Forfeited
(119
)
 
$
4.65

Unvested units at March 31, 2019
5,441

 
$
4.69