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Selected Quarterly Financial Data (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effect Of Fourth Quarter Events [Line Items]                      
Motor fuel sales $ 2,758 $ 2,849 $ 2,685 $ 2,618 $ 2,634 $ 2,415 $ 2,367 $ 1,796      
Merchandise 142 151 147 131 133 142 138 128 $ 571 $ 541 $ 544
Rental and other income 59 64 60 59 57 62 58 56      
Total revenues 2,959 3,064 2,892 2,808 2,824 2,619 2,563 1,980 11,723 9,986 12,430
Motor fuel gross profit 176 203 155 158 197 182 206 174      
Merchandise gross profit 45 49 48 43 44 46 46 42 185 178 179
Other gross profit 56 64 56 55 55 54 56 54      
Gross profit 277 316 259 256 296 282 308 270 1,108 1,156 980
Income from operations 65 128 (20) 56 (140) 76 120 89 229 145 252
Net Income (loss) $ 232 $ 138 $ (222) $ 1 $ (585) $ 45 $ 72 $ 62 149 (406) 194
Net income (loss) attributable to partners                 $ 149 $ (406) $ 87
Income (Loss) from Continuing Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted                 $ 2.12 $ (0.32) $ 0.91
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic                 (1.78) (4.94) 0.20
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted                 (1.78) (4.94) 0.20
Common Units [Member]                      
Effect Of Fourth Quarter Events [Line Items]                      
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership Unit, Basic, Net of Tax $ 1.91 $ 0.92 $ (0.58) $ (0.11) $ (1.51) $ 0.09 $ 0.60 $ 0.56 $ 2.13 $ (0.32) $ 0.91
Income (Loss) from Continuing Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted 1.90 0.91 (0.59) (0.11) (1.51) 0.09 0.60 0.56      
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic 0.11 0.17 (1.94) (0.11) (4.81) 0.15 (0.07) (0.09)      
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted $ 0.11 $ 0.17 $ (1.94) $ (0.11) $ (4.81) $ 0.15 $ (0.07) $ (0.09)