Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenues	$ 2,805	$ 4,331	$ 8,157	$ 12,498
Cost of sales and operating expenses:
Cost of sales	2,497	4,039	7,383	11,567
General and administrative	28	40	87	101
Other operating	68	79	219	236
Lease expense	16	15	46	45
Loss (gain) on disposal of assets and impairment charges	(1)	(4)	7	46
Depreciation, amortization and accretion	50	45	142	137
Total cost of sales and operating expenses	2,658	4,214	7,884	12,132
Operating income	147	117	273	366
Interest expense, net	(43)	(45)	(131)	(130)
Other income (expense), net	0	0	0	3
Equity in earnings of unconsolidated affiliate	1	0	3	0
Income before income taxes	105	72	145	239
Income tax expense	5	6	16	9
Net income and comprehensive income	$ 100	$ 66	$ 129	$ 230
Net income (loss) per common unit:
Common units - basic	$ 0.97	$ 0.57	$ 0.85	$ 2.09
Common units - diluted	$ 0.96	$ 0.57	$ 0.84	$ 2.07
Weighted average common units outstanding:
Common units - basic	83,056,365	82,749,644	83,033,556	82,734,526
Common units - diluted	83,770,034	83,649,898	83,668,835	83,512,121
Cash distributions per unit	$ 0.8255	$ 0.8255	$ 2.4765	$ 2.4765
Common Units [Member]
Weighted average common units outstanding:
Common units - basic	83,056,365	82,749,644	83,033,556	82,734,526
Common units - diluted	83,770,034	83,649,898	83,668,835	83,512,121
Motor Fuel Sales [Member]
Revenues:
Revenues	$ 2,711	$ 4,225	$ 7,869	$ 12,174
Non Motor Fuel Sales [Member]
Revenues:
Revenues	60	69	185	217
Lease Income [Member]
Revenues:
Revenues	$ 34	$ 37	$ 103	$ 107