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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended						12 Months Ended
	Dec. 02, 2021	Dec. 05, 2019	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Impairment losses									$ 21	$ 2,880	$ 74
Asset Retirement Obligation			$ 369	$ 280					369	280
Costs Incurred, Asset Retirement Obligation Incurred									12	16	5
Asset Retirement Obligation, Legally Restricted Assets, Fair Value			39	34					39	34
Long-term Debt, Fair Value			54,970	56,210					54,970	56,210
Impairment losses							$ (9)	$ (12)		(2,815)
Goodwill									142	9
Goodwill			2,533	2,391			5,167		2,533	2,391	5,167
Long-term Debt			49,702	51,438					49,702	51,438
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net									0
Inventory Write-down									190	82	79
Inventory Valuation Reserves				121			311			121	311
Impairment of investment in unconsolidated affiliates									0	129	0
Revenue from Related Parties									410	466	492
White Cliffs
Impairment of investment in unconsolidated affiliates										129
Midstream
Impairment losses						$ (483)				(483)
Goodwill									0	0
Goodwill			0	0			483		0	0	483
All Other
Impairment losses				(15)	$ (132)	(40)				(198)
Goodwill									0	0
Goodwill			82	82			184		82	82	184
Investment in Sunoco LP
Impairment losses										0
Goodwill									4	9
Goodwill			1,568	1,564			1,555		1,568	1,564	1,555
Retail Marketing [Member]
Excise Taxes Collected									332	301	386
Interstate Transportation and Storage
Impairment losses										58
Impairment losses					(43)	(183)				(226)
Goodwill									0	0
Goodwill			0	0			226		0	0	226
Investment in USAC
Impairment losses						$ (619)				(619)
Goodwill									0	0
Goodwill			0	0			619		0	0	619
Crude Oil Transportation and Services
Impairment losses					$ (1,280)					(1,279)
Goodwill									138	0
Goodwill			190	52			1,397		190	52	1,397
Intrastate Transportation and Storage
Impairment losses				(10)						(10)
Goodwill									0	0
Goodwill			0	0			10		0	0	10
Sunoco LP [Member]
Impairment losses											47
Long-term Debt			3,255	3,112					3,255	3,112
USAC [Member]
Impairment losses									5	$ 8	$ 6
PEI [Member] | All Other
Impairment losses				$ (11)
ETC Marketing | All Other
Goodwill			72						$ 72
SemGroup [Member]
Goodwill		$ 295					$ 265
Enable
Long-term Debt, Fair Value	$ 3,430
Goodwill	$ 138		138
Sunoco LP [Member]
Goodwill			$ 4

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