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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) |  |  |

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