Segment Reporting (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenues		$ 4,098	$ 4,331	$ 4,475	$ 3,692	$ 3,877	$ 4,761	$ 4,607	$ 3,749	$ 16,596	$ 16,994	$ 11,723
Gross profit	[1]									1,216	1,122	1,108
Total operating expenses										752	777	879
Operating income		98	$ 117	$ 97	$ 152	(38)	$ 159	$ 128	$ 96	464	345	229
Interest expense, net										(173)	(144)	(209)
Other expense (income), net										(3)	0	0
Loss on extinguishment of debt and other, net										0	109	0
Income (loss) from continuing operations before income taxes										296	92	20
Income tax expense (benefit)										(17)	34	(306)
Income from continuing operations										313	58	326
Loss from discontinued operations, net of income taxes										0	(265)	(177)
Net income (loss) and comprehensive income (loss)										313	(207)	149
Depreciation, amortization and accretion										183	182	169
Interest expense, net										173	144	209
Non-cash unit-based compensation expense										13	12	24
Loss on disposal of assets and impairment charges										68
Unrealized gain on commodity derivatives										(5)
Inventory fair value adjustments										(79)
Equity in earnings of unconsolidated affiliate										(2)	0	0
Adjusted EBITDA related to unconsolidated affiliate										4
Other non-cash adjustments										14
Adjusted EBITDA										665
Capital expenditures										148
Total assets		5,438				4,879				5,438	4,879
Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Total revenues											17,281	10,932
Gross profit	[1]										831	651
Total operating expenses											538	406
Operating income											293	245
Interest expense, net											(103)	(88)
Loss on extinguishment of debt and other, net											109
Income (loss) from continuing operations before income taxes											81	157
Income tax expense (benefit)											1	(10)
Income from continuing operations											80	167
Loss from discontinued operations, net of income taxes											0	0
Net income (loss) and comprehensive income (loss)											80	167
Interest expense, net											103	88
All Other [Member]
Segment Reporting Information [Line Items]
Total revenues											1,482	2,388
Gross profit	[1]										291	457
Total operating expenses											239	473
Operating income											52	(16)
Interest expense, net											(41)	(121)
Loss on extinguishment of debt and other, net											0
Income (loss) from continuing operations before income taxes											11	(137)
Income tax expense (benefit)											33	(296)
Income from continuing operations											(22)	159
Loss from discontinued operations, net of income taxes											(265)	(177)
Net income (loss) and comprehensive income (loss)											(287)	(18)
Interest expense, net											41	121
Operating Segments [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Total revenues										17,360
Gross profit	[1]									1,001
Total operating expenses										550
Operating income										451
Interest expense, net										(146)
Other expense (income), net										(3)
Income (loss) from continuing operations before income taxes										310
Income tax expense (benefit)										20
Net income (loss) and comprehensive income (loss)										290
Depreciation, amortization and accretion										144
Interest expense, net										146
Non-cash unit-based compensation expense										13
Loss on disposal of assets and impairment charges										0
Unrealized gain on commodity derivatives										(5)
Inventory fair value adjustments										(79)
Equity in earnings of unconsolidated affiliate										(2)
Adjusted EBITDA related to unconsolidated affiliate										4
Other non-cash adjustments										14
Adjusted EBITDA										545
Capital expenditures										111
Total assets		4,189								4,189
Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Total revenues										929
Gross profit	[1]									215
Total operating expenses										202
Operating income										13
Interest expense, net										(27)
Other expense (income), net										0
Income (loss) from continuing operations before income taxes										(14)
Income tax expense (benefit)										(37)
Net income (loss) and comprehensive income (loss)										23
Depreciation, amortization and accretion										39
Interest expense, net										27
Non-cash unit-based compensation expense										0
Loss on disposal of assets and impairment charges										(68)
Unrealized gain on commodity derivatives										0
Inventory fair value adjustments										0
Equity in earnings of unconsolidated affiliate										0
Adjusted EBITDA related to unconsolidated affiliate										0
Other non-cash adjustments										0
Adjusted EBITDA										120
Capital expenditures										37
Total assets		$ 1,249								1,249
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues										(1,693)	(1,769)	(1,597)
Including Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Interest expense, net	[2]										(146)	(245)
Loss on extinguishment of debt and other, net	[2]										129
Income tax expense (benefit)	[2]										192	(258)
Depreciation, amortization and accretion											182	203	[2]
Interest expense, net	[2]										146	245
Non-cash unit-based compensation expense	[2]										12	24
Loss on disposal of assets and impairment charges	[2]										(80)	(400)
Unrealized gain on commodity derivatives	[2]										6	(3)
Inventory fair value adjustments	[2]										84	(28)
Other non-cash adjustments											14
Adjusted EBITDA											638	732
Capital expenditures											103	177	[2]
Total assets						4,879					4,879	8,344	[2]
Including Discontinued Operations [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Interest expense, net	[2]										(103)	(88)
Loss on extinguishment of debt and other, net	[2]										109
Income tax expense (benefit)	[2]										1	(10)
Depreciation, amortization and accretion											128	118	[2]
Interest expense, net	[2]										103	88
Non-cash unit-based compensation expense	[2]										2	2
Loss on disposal of assets and impairment charges	[2]										(27)	(8)
Unrealized gain on commodity derivatives	[2]										6	(3)
Inventory fair value adjustments	[2]										84	(24)
Other non-cash adjustments											14
Adjusted EBITDA											554	346
Capital expenditures											77	71	[2]
Total assets						3,878					3,878	3,130	[2]
Including Discontinued Operations [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Interest expense, net	[2]										(43)	(157)
Loss on extinguishment of debt and other, net	[2]										20
Income tax expense (benefit)	[2]										191	(248)
Depreciation, amortization and accretion											54	85	[2]
Interest expense, net	[2]										43	157
Non-cash unit-based compensation expense	[2]										10	22
Loss on disposal of assets and impairment charges	[2]										(53)	(392)
Unrealized gain on commodity derivatives	[2]										0	0
Inventory fair value adjustments	[2]										0	(4)
Other non-cash adjustments											0
Adjusted EBITDA											84	386
Capital expenditures											26	106	[2]
Total assets						$ 1,001					1,001	5,214	[2]
Motor Fuel Sales [Member]
Segment Reporting Information [Line Items]
Total revenues										16,176	16,504	10,910
Gross profit	[1]									906	796	692
Motor Fuel Sales [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]										673	535
Motor Fuel Sales [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]										123	157
Motor Fuel Sales [Member] | Operating Segments [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]									817
Motor Fuel Sales [Member] | Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]									89
Non Motor Fuel Sales [Member]
Segment Reporting Information [Line Items]
Total revenues										278	360	724
Gross profit	[1]									168	196	327
Non Motor Fuel Sales [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]										40	39
Non Motor Fuel Sales [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]										156	288
Non Motor Fuel Sales [Member] | Operating Segments [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]									53
Non Motor Fuel Sales [Member] | Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]									115
Lease income [Member]
Segment Reporting Information [Line Items]
Total revenues										142	130	89
Gross profit	[1]									142	130	89
Lease income [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]										118	77
Lease income [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]										12	12
Lease income [Member] | Operating Segments [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]									131
Lease income [Member] | Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Gross profit	[1]									11
Intersegment Sales [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues										(1,693)	(1,769)	(1,597)
Intersegment Sales [Member] | Intersegment Eliminations [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Total revenues										1,645	1,649	1,472
Intersegment Sales [Member] | Intersegment Eliminations [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Total revenues										48	120	125
External Revenue [Member]
Segment Reporting Information [Line Items]
Total revenues										16,596	16,994
External Revenue [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Total revenues										15,715	15,632
External Revenue [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Total revenues										881	1,362
External Revenue [Member] | Motor Fuel Sales [Member]
Segment Reporting Information [Line Items]
Total revenues										16,176	16,504	10,910
External Revenue [Member] | Motor Fuel Sales [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Total revenues										15,522	15,466	9,333
External Revenue [Member] | Motor Fuel Sales [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Total revenues										654	1,038	1,577
External Revenue [Member] | Non Motor Fuel Sales [Member]
Segment Reporting Information [Line Items]
Total revenues										278	360	724
External Revenue [Member] | Non Motor Fuel Sales [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Total revenues										62	48	50
External Revenue [Member] | Non Motor Fuel Sales [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Total revenues										216	312	674
External Revenue [Member] | Lease income [Member]
Segment Reporting Information [Line Items]
Total revenues										142	130	89
External Revenue [Member] | Lease income [Member] | Fuel Distribution and Marketing [Member]
Segment Reporting Information [Line Items]
Total revenues										131	118	77
External Revenue [Member] | Lease income [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Total revenues										$ 11	$ 12	$ 12

[1] Excludes depreciation, amortization and accretion.

[2] Includes amounts from discontinued operations.