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Spin-off of Distribution Business (Tables) | 6 Months Ended
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Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract] |
Schedule of Selected Financial Information Reported as Discontinued Operations | The following table presents selected financial information regarding the results of operations of our distribution business, which is reported as discontinued operations (in millions):
|  | Three Months Ended June 30, 2014 |  |  | Six Months Ended June 30, 2014 |
Revenue from discontinued operations |  | $ | 624 |  |  | $ | 1,701 |
Income from discontinued operations before income taxes |  |  | 21 |  |  |  | 83 |
Income tax expense |  |  | 10 |  |  |  | 31 |
Income from discontinued operations |  | $ | 11 |  |  | $ | 52 |

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