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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Impairment losses						$ 2,880	$ 74	$ 431
Operating Lease, Liability	$ 890					890
Operating Lease, Right-of-Use Asset	1,000			$ 964		1,000	964
Asset Retirement Obligation	270			247		270	247
Costs Incurred, Asset Retirement Obligation Incurred						16	5	13
Tangible Asset Impairment Charges								9
Asset Retirement Obligation, Legally Restricted Assets, Fair Value	34			31		34	31
Long-term Debt, Fair Value	56,210			54,790		56,210	54,790
Impairment losses				(9)	$ (12)	(2,815)	(21)
Goodwill acquired						9	307
Goodwill	2,391			5,167		2,391	5,167	4,885
Long-term Debt	51,438			51,054		51,438	51,054
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net						0
Inventory Write-down						82
Inventory Valuation Reserves				311			311	229
Midstream [Member]
Impairment losses			$ (483)	(378)		(483)	(9)
Goodwill acquired						0	0
Goodwill	0			483		0	483	492
Other Segments [Member]
Impairment losses	(15)	$ (132)	(40)			(198)	0
Goodwill acquired						0	35
Goodwill	82			184		82	184	149
Investment In Sunoco LP [Member]
Impairment losses						0	0
Goodwill acquired						9	0
Goodwill	1,564			1,555		1,564	1,555	1,559
Retail Marketing [Member]
Excise Taxes Collected						301	386	370
Interstate Transportation and Storage [Member]
Impairment losses						58
Impairment losses		(43)	(183)			(226)	(12)
Goodwill acquired						0	42
Goodwill	0			226		0	226	196
Investment In USAC [Member]
Impairment losses			$ (619)			(619)	0
Goodwill acquired						0	0
Goodwill	0			619		0	619	619
Crude oil transportation and services [Member]
Impairment losses		$ (1,280)				(1,279)	0
Goodwill acquired						0	230
Goodwill	52			1,397		52	1,397	1,167
Intrastate Transportation And Storage [Member]
Impairment losses	(10)					(10)	0
Goodwill acquired						0	0
Goodwill	0			10		0	10	$ 10
Sunoco LP [Member]
Impairment losses							47
Long-term Debt	3,112			3,071		3,112	3,071
USAC [Member]
Impairment losses						8	$ 6
PEI [Member] | Other Segments [Member]
Impairment losses	(11)
SemGroup [Member]
Impairment losses						(244)
Goodwill acquired				265
Fair value exceeding carrying value by less than 20% [Member]
Goodwill	$ 368					$ 368
Customer relationships, contracts and agreements (3 to 46 years)
Impairment of Intangible Assets (Excluding Goodwill)				$ 30

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