Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Revenues	$ 4,475	$ 4,607	$ 8,167	$ 8,356
Cost of sales and operating expenses:
Cost of Revenue	4,206	4,297	7,528	7,750
General and administrative	34	34	61	69
Other operating	73	86	157	184
Lease expense	16	19	30	34
Loss on disposal of assets and impairment charges	2	2	50	5
Depreciation, amortization and accretion	47	41	92	90
Total cost of sales and operating expenses	4,378	4,479	7,918	8,132
Operating income	97	128	249	224
Interest expense, net	43	36	85	70
Loss on extinguishment of debt and other, net	(6)	0	(3)	109
Income from continuing operations before income taxes	60	92	167	45
Income tax expense (benefit)	5	(2)	3	29
Income from continuing operations	55	94	164	16
Loss from discontinued operations, net of income taxes	0	(26)	0	(263)
Net income (loss) and comprehensive income (loss)	$ 55	$ 68	$ 164	$ (247)
Net income (loss) per common unit - basic:
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership Unit, Basic, Net of Tax	$ 0.44	$ 0.91	$ 1.51	$ (0.29)
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic	0.00	(0.32)	0.00	(3.05)
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax	0.44	0.59	1.51	(3.34)
Net income (loss) per common unit - diluted:
Income (Loss) from Continuing Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted	0.43	0.90	1.50	(0.29)
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Diluted	0.00	(0.32)	0.00	(3.05)
Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted	$ 0.43	$ 0.58	$ 1.50	$ (3.34)
Weighted average limited partner units outstanding:
Weighted average limited partner units outstanding (basic) (in shares)	82,742,323	82,494,976	82,726,842	86,104,411
Weighted Average Limited Partnership Units Outstanding, Diluted	83,509,987	82,947,669	83,455,021	86,569,372
Cash distribution per common unit (in shares)	$ 0.8255	$ 0.8255	$ 1.6510	$ 1.6510
Common Units [Member]
Net income (loss) per common unit - basic:
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership Unit, Basic, Net of Tax	0.44	0.91	1.51	(0.29)
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic	$ 0.00	$ (0.32)	$ 0.00	$ (3.05)
Weighted average limited partner units outstanding:
Weighted average limited partner units outstanding (basic) (in shares)	82,742,323	82,494,976	82,726,842	86,104,411
Weighted Average Limited Partnership Units Outstanding, Diluted	83,509,987	82,947,669	83,455,021	86,569,372
Motor Fuels [Member]
Revenues:
Revenues	$ 4,366	$ 4,507	$ 7,949	$ 8,058
Leases [Member]
Revenues:
Revenues	35	34	70	56
Non Motor Fuel Sales [Member]
Revenues:
Revenues	74	66	148	242
Continuing Operations [Member]
Cost of sales and operating expenses:
Interest expense, net	$ 43	$ 36	$ 85	$ 70