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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Impairment losses				$ 74	$ 431	$ 1,039
Operating Lease, Liability				961
Operating Lease, Right-of-Use Asset		$ 0		1,000	0		$ 889
Asset Retirement Obligation		193		247	193
Costs Incurred, Asset Retirement Obligation Incurred				5	13	9
Tangible Asset Impairment Charges				9	127
Asset Retirement Obligation, Legally Restricted Assets, Fair Value		26		31	26
Long-term Debt, Fair Value		45,060		54,790	45,060
Impairment losses	$ (12)	(9)		(21)	(378)
Goodwill acquired				307	495
Goodwill		4,885	$ 4,768	5,167	4,885	4,768
Long-term Debt		46,028		51,054	46,028
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net				0
Midstream [Member]
Impairment losses		378		(9)	(378)
Goodwill acquired				0	0
Goodwill		492	870	483	492	870
Other Segments [Member]
Impairment losses			(452)	0	0
Goodwill acquired				35	0
Goodwill		149	402	184	149	402
Investment In Sunoco LP [Member]
Impairment losses			(387)	0	0
Goodwill acquired				0	129
Goodwill		1,559	1,430	1,555	1,559	1,430
Retail Marketing [Member]
Excise Taxes Collected				386	370	$ 234
Sunoco LP [Member]
Impairment losses				47
Inventory Write-down					85
Long-term Debt		2,984		3,071	$ 2,984
USAC [Member]
Impairment losses				6
SemGroup [Member]
Goodwill acquired				265
Fair value exceeding carrying value by less than 20% [Member]
Goodwill				380
Customer relationships, contracts and agreements (3 to 46 years)
Impairment of Intangible Assets (Excluding Goodwill)		$ 30		$ 17
Continuing Operations [Member] | Investment In Sunoco LP [Member]
Impairment losses			$ (102)

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