Stock-Based Compensation (Tables)
 12 Months Ended
Feb. 03, 2018
Share-based Compensation [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The components of total stock-based compensation costs are as follows:
($ in millions)
2017
 
2016
 
2015
Stock awards
$
18

 
$
27

 
$
32

Stock options
7

 
8

 
12

Total stock-based compensation (1)
$
25

 
$
35

 
$
44

 
 
 
 
 
 
Total income tax benefit recognized for stock-based compensation arrangements
$
—

 
$
—

 
$
—


(1)
Excludes $2 million, $0 million and $9 million for 2017, 2016 and 2015, respectively, of stock-based compensation costs reported in restructuring and management transition charges (Note 17).
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes stock option activity during the year ended February 3, 2018:
 
 
Shares (in thousands)
 
Weighted - Average Exercise Price Per Share
 
Weighted - Average Remaining Contractual Term (in years)
 
Aggregate Intrinsic Value ($ in millions) (1) 
Outstanding at January 28, 2017
 
14,418

 
$
18

 
 
 
 
Granted
 
3,318

 
6

 
 
 
 
Exercised
 
—

 
—

 
 
 
 
Forfeited/canceled
 
(3,461
)
 
24

 
 
 
 
Outstanding at February 3, 2018
 
14,275

 
14

 
5.5
 
$
—

Exercisable at February 3, 2018
 
7,446

 
19

 
3.6
 
$
—

 
(1)
The intrinsic value of a stock option is the amount by which the market value of the underlying stock exceeds the exercise price of the option at year end.
Schedule of Cash Proceeds Received from Share-based Payment Awards
Cash proceeds, tax benefits and intrinsic value related to total stock options exercised are provided in the following table:
($ in millions)
 
2017
 
2016
 
2015
Proceeds from stock options exercised
 
$
—

 
$
2

 
$
—

Intrinsic value of stock options exercised
 
—

 
—

 
—

Tax benefit related to stock-based compensation
 
—

 
—

 
—

Excess tax benefits realized on stock-based compensation
 
—

 
—

 
—
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
Our weighted-average fair value of stock options at grant date was $2.91 in 2017, $4.89 in 2016 and $3.48 in 2015. We primarily used the binomial lattice valuation model to determine the fair value of the stock options granted using the following assumptions:
 
 
2017
 
2016
 
2015
Weighted-average expected option term
 
4.6 years
 
4.7 years
 
4.6 years
Weighted-average expected volatility
 
57.90%
 
54.22%
 
51.46%
Weighted-average risk-free interest rate
 
2.02%
 
1.38%
 
1.50%
Weighted-average expected dividend yield (1)
 
—%
 
—%
 
—%
Expected dividend yield range (1)
 
—%
 
—%
 
—%


(1) Following the May 1, 2012 payment, we discontinued paying dividends.
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes our non-vested stock awards activity during the year ended February 3, 2018:  
 
Time-Based Stock Awards
 
Performance-Based Stock Awards
(shares in thousands)
Number of Units
 
Weighted-Average Grant Date Fair Value
 
Number of Units
 
Weighted-Average Grant Date Fair Value
Non-vested at January 28, 2017
5,818

 
$
9

 
3,128

 
$
8

Granted
2,859

 
6

 
1,727

 
6

Vested
(3,218
)
 
8

 
(262
)
 
6

Forfeited/canceled
(1,011
)
 
8

 
(659
)
 
8

Non-vested at February 3, 2018
4,448

 
7

 
3,934

 
7