Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenues	$ 2,080	$ 4,475	$ 5,352	$ 8,167
Cost of sales and operating expenses:
Cost of sales	1,722	4,206	4,886	7,528
General and administrative	25	34	59	61
Other operating	56	73	151	157
Lease expense	16	16	30	30
Loss on disposal of assets and impairment charges	6	2	8	50
Depreciation, amortization and accretion	47	47	92	92
Total cost of sales and operating expenses	1,872	4,378	5,226	7,918
Operating income	208	97	126	249
Interest expense, net	(44)	(43)	(88)	(85)
Other income (expense), net	0	6	0	3
Equity in earnings of unconsolidated affiliate	1	0	2	0
Income before income taxes	165	60	40	167
Income tax expense	8	5	11	3
Net income and comprehensive income	$ 157	$ 55	$ 29	$ 164
Net income (loss) per common unit:
Common units - basic	$ 1.65	$ 0.44	$ (0.12)	$ 1.51
Common units - diluted	$ 1.64	$ 0.43	$ (0.12)	$ 1.50
Weighted average common units outstanding:
Common units - basic	83,030,286	82,742,323	83,022,027	82,726,842
Common units - diluted	83,598,730	83,509,987	83,022,027	83,455,021
Cash distributions per unit	$ 0.8255	$ 0.8255	$ 1.6510	$ 1.6510
Common Units [Member]
Weighted average common units outstanding:
Common units - basic	83,030,286	82,742,323	83,022,027	82,726,842
Common units - diluted	83,598,730	83,509,987	83,022,027	83,455,021
Motor Fuel Sales [Member]
Revenues:
Revenues	$ 1,992	$ 4,366	$ 5,158	$ 7,949
Non Motor Fuel Sales [Member]
Revenues:
Revenues	54	74	125	148
Lease Income [Member]
Revenues:
Revenues	$ 34	$ 35	$ 69	$ 70