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Discontinued Operations (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) stores | Dec. 31, 2017 USD ($) stores | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Apr. 06, 2017 USD ($) stores | Jan. 18, 2017 stores
Goodwill | $ 1,430 | $ 1,430 | $ 1,550 | $ 1,694 |  |
Intangible assets, net | $ 768 | 768 | 775 |  |  |
Number of stores | stores |  |  |  |  | 207 |
Goodwill, Impairment charges, including discontinued operations |  | 387 |  |  |  |
Impairment in goodwill |  | (102) | (227) |  |  |
Non-cash unit based compensation expense |  | 24 | 13 | 8 |  |
Tangible Asset Impairment Charges |  | 4 |  |  |  |
Portfolio Optimization Plan [Member] |  |  |  |  |  |
Number of stores | stores |  |  |  |  |  | 97
7-Eleven sales [Member] |  |  |  |  |  |
Number of stores | stores |  |  |  |  | 1,030 |
Business acquisition, total purchase price |  |  |  |  | $ 3,300 |
Transaction cost |  | 37 |  |  |  |
Non-cash unit based compensation expense |  | $ 6 |  |  |  |
Sold store [Member] | Portfolio Optimization Plan [Member] |  |  |  |  |  |
Number of stores | stores | 40 | 40 |  |  |  |
Stores under contract [Member] | Portfolio Optimization Plan [Member] |  |  |  |  |  |
Number of stores | stores | 5 | 5 |  |  |  |
stores on market [Member] | Portfolio Optimization Plan [Member] |  |  |  |  |  |
Number of stores | stores | 11 | 11 |  |  |  |
Other entities [Member] | Sold store [Member] | Portfolio Optimization Plan [Member] |  |  |  |  |  |
Number of stores | stores | 9 | 9 |  |  |  |
7-Eleven sales [Member] | Sold store [Member] | Portfolio Optimization Plan [Member] |  |  |  |  |  |
Number of stores | stores | 32 | 32 |  |  |  |
Retail Segment [Member] |  |  |  |  |  |
Goodwill | $ 678 | $ 678 | 780 | $ 1,007 |  |
Impairment in goodwill |  | 102 | (227) |  |  |
Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |
Goodwill | 796 | 796 | 1,068 |  |  |
Intangible assets, net | 477 | $ 477 | $ 480 |  |  |
Impairment in goodwill | $ (23) |  |  |  |  |

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