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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended				12 Months Ended
	Apr. 01, 2022	Dec. 02, 2021	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Impairment losses and other							$ 386	$ 21	$ 2,880
Asset Retirement Obligation			$ 369				362	369
Costs Incurred, Asset Retirement Obligation Incurred							4	12	16
Asset Retirement Obligation, Legally Restricted Assets, Fair Value			39				27	39
Long-term Debt, Fair Value			54,970				45,420	54,970
Goodwill							33	142
Goodwill			2,533	$ 2,391			2,566	2,533	2,391
Long-term Debt			49,702				48,262	49,702
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net							0
Inventory Write-down							5	190	82
Inventory Valuation Reserves			121				116	121
Impairment of investment in unconsolidated affiliates							0	0	129
Revenue from Related Parties							391	410	466
Reporting units for which the estimated FV exceeds the carrying value by less than 20%
Goodwill							368
White Cliffs
Impairment of investment in unconsolidated affiliates								129	129
Midstream
Impairment losses						$ (483)
Goodwill							0	0
Goodwill			0	0			0	0	0
All Other
Impairment losses				(15)	$ (132)	(40)
Goodwill							0	0
Goodwill			82	82			82	82	82
Investment in Sunoco LP
Goodwill							33	4
Goodwill			1,568	1,564			1,601	1,568	1,564
Retail Marketing [Member]
Excise Taxes Collected							285	332	301
Interstate Transportation and Storage
Impairment losses and other									58
Impairment losses					(43)	(183)
Goodwill							0	0
Goodwill			0	0			0	0	0
Investment in USAC
Impairment losses						$ (619)
Goodwill							0	0
Goodwill			0	0			0	0	0
Crude Oil Transportation and Services
Impairment losses					$ (1,280)
Goodwill							0	138
Goodwill			190	52			190	190	52
Intrastate Transportation and Storage
Impairment losses				(10)
Goodwill							0	0
Goodwill			0	0			0	0	0
Sunoco LP [Member]
Goodwill	$ 20
Long-term Debt			3,255				3,571	3,255
USAC [Member]
Impairment losses and other							1	$ 5	$ 8
PEI [Member] | All Other
Impairment losses				$ (11)
Enable
Long-term Debt, Fair Value		$ 3,430
Goodwill		$ 138	138
Sunoco LP [Member]
Goodwill			$ 4				$ 33

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