Stock-Based Compensation (Stock Awards) (Details) - USD ($)
$ / shares in Units, $ in Millions |
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3 Months Ended |
6 Months Ended |
Jun. 12, 2015 |
[1] |
Jun. 05, 2015 |
May. 21, 2015 |
May. 19, 2015 |
Mar. 20, 2015 |
Mar. 04, 2015 |
Mar. 20, 2014 |
Aug. 01, 2015 |
Aug. 02, 2014 |
Aug. 01, 2015 |
Aug. 02, 2014 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 15
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$ 11
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$ 30
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$ 21
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| Granted, weighted average grant date fair value (in dollars per share) |
$ 4.78
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$ 6.28
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$ 6.38
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$ 8.55
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$ 5.36
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$ 7.88
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$ 5.40
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| Director [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, stock awards |
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154,000
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| Stock Options [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, weighted-average exercise price (in dollars per share) |
$ 8.35
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$ 8.64
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$ 8.66
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$ 7.77
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$ 7.81
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| Stock Options [Member] | Time-based [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, stock options |
78,358
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123,188
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38,624
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4,294,885
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4,535,055
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| Restricted Stock Units (RSUs) [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock awards, fair value remeasured at period end (in dollars per share) |
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$ 8.64
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$ 8.64
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| Restricted Stock Units (RSUs) [Member] | Time-based [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, stock awards |
31,437
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49,190
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15,878
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11,696
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2,135,177
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28,554
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2,271,932
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| Restricted Stock Units (RSUs) [Member] | Performance-based [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, stock awards |
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98,380
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31,755
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1,534,754
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1,664,889
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| Phantom Shares [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Granted, stock awards |
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2,500,000
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| Maximum award settlement (in dollars per share) |
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$ 15.54
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| Stock awards, fair value remeasured at period end (in dollars per share) |
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$ 8.24
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$ 8.24
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| 2014 Long-Term Incentive Plan [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock awards, number of shares available for grant |
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11,600,000
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11,600,000
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