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Inventories, net (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
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