Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Stock-Based Compensation [Abstract]

Schedule of Stock-Based Compensation Costs

	For the three months ended September 30,				For the nine months ended September 30,
(in millions)	2018		2017		2018		2017
Stock-based compensation cost – expensed	$	7	$	7	$	20	$	19
Stock-based compensation cost – capitalized	$	3	$	2	$	10	$	10

Schedule of Equity-Classified Stock-Based Compensation Costs

	For the three months ended September 30,				For the nine months ended September 30,
(in millions)	2018		2017		2018		2017
Equity-classified awards – expensed	$	3	$	7	$	12	$	19
Equity-classified awards – capitalized	$	2	$	2	$	6	$	10

Summary of Equity-Classified Stock Option Activity

	Number	Weighted Average
	of Options	Exercise Price
	(in thousands)
Outstanding at December 31, 2017	6,020	$	19.43
Granted	–		–
Exercised	–		–
Forfeited or expired	(72)		26.87
Outstanding at September 30, 2018	5,948		19.34
Exercisable at September 30, 2018	4,422		23.30

Summary of Equity-Classified Restricted Stock Activity

	Number	Weighted Average
	of Shares	Fair Value
	(in thousands)
Unvested shares at December 31, 2017	6,254	$	8.85
Granted	344		4.71
Vested (1)	(1,462)		8.39
Forfeited	(1,143)		9.03
Unvested shares at September 30, 2018	3,993		8.61

(1) Includes 670,385 shares forfeited as a result of the reduction in workforce.

Summary of Equity-Classified Performance Units Activity

	Number	Weighted Average
	of Shares (1)	Fair Value
	(in thousands)
Unvested units at December 31, 2017	1,084	$	10.12
Granted	–		–
Vested	(290)		10.47
Forfeited	(125)		9.91
Unvested units at September 30, 2018	669		10.01

(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.

(2) Includes 95,914 units forfeited as a result of the reduction in workforce.

Schedule of Liability-Classified Stock-Based Compensation Costs

	For the three months		For the nine months
	ended September 30,		ended September 30,
(in millions)	2018		2018
Liability-classified stock-based compensation cost – expensed	$	4	$	8
Liability-classified stock-based compensation cost – capitalized	$	1	$	4

Summary of Liability-Classified Restricted Stock Unit Activity

	Number	Weighted Average
	of Units	Fair Value
	(in thousands)
Unvested shares at December 31, 2017	–	$	–
Granted	12,216		3.69
Vested	(232)		5.14
Forfeited	(2,297)		5.14
Unvested units at September 30, 2018	9,687		5.11

(1) Includes 1,503,470 units forfeited as a result of the reduction in workforce.

Summary of Liability-Classified Performance Unit Activity

	Number	Weighted Average
	of Shares	Fair Value
	(in thousands)
Unvested shares at December 31, 2017	–	$	–
Granted	3,200		3.70
Vested	–		–
Forfeited (1)	(210)		4.87
Unvested units at September 30, 2018	2,990		5.11

(1) Includes 191,790 units forfeited as a result of the reduction in workforce.