Stock-Based Compensation (Stock Awards) (Details) - USD ($)
$ / shares in Units, $ in Millions |
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3 Months Ended |
9 Months Ended |
Oct. 06, 2015 |
Aug. 18, 2015 |
Aug. 07, 2015 |
Jun. 11, 2015 |
[1] |
Jun. 04, 2015 |
May. 20, 2015 |
May. 18, 2015 |
Mar. 19, 2015 |
Mar. 03, 2015 |
Mar. 20, 2014 |
Oct. 31, 2015 |
Aug. 01, 2015 |
Nov. 01, 2014 |
Oct. 31, 2015 |
Nov. 01, 2014 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation expense |
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$ 17
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$ 10
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$ 47
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$ 31
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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) |
$ 9.79
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$ 8.35
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$ 8.64
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$ 8.66
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$ 7.77
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$ 7.92
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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 |
269,608
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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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4,804,663
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
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$ 3.48
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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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| 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 |
112,359
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211,161
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303,398
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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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2,898,850
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| Granted, weighted average grant date fair value (in dollars per share) |
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$ 7.99
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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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| Granted, weighted average grant date fair value (in dollars per share) |
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$ 7.44
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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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$ 9.17
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$ 9.17
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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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11,400,000
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11,400,000
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