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Mergers and Acquisitions - Schedules (Details) - USD ($) $ in Millions | Aug. 31, 2016 | Aug. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 1,430 | $ 1,550 | $ 1,694
Susser [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net assets |  | $ 1,669 |  |  |
Total cash consideration, net of cash acquired |  | $ 903 |  |  |
Emerge Energy Services L P [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets | $ 27 |  |  |  |
Property and equipment | 51 |  |  |  |
Goodwill | 53 |  |  |  |
Intangible assets | 56 |  |  |  |
Current liabilities | (16) |  |  |  |
Net assets | 171 |  |  |  |
Cash acquired | 0 |  |  |  |
Total cash consideration, net of cash acquired | $ 171 |  |  |  |

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