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Inventories, net (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Inventory Disclosure [Abstract] |  |
Fuel-retail | $ 52 | $ 58
Fuel-wholesale | 313 | 364
Fuel-consignment | 4 | 5
Merchandise | 120 | 123
Equipment and maintenance spare parts | 12 | 13
Other | 11 | 10
Inventories, net | $ 512 | $ 573

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