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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Asset Retirement Obligation	$ 165	$ 170
Tangible Asset Impairment Charges	127	133		$ 110
ARO Underlying Asset	2	14
Impairment of Intangible Assets, Finite-lived				24
Asset Retirement Obligation, Legally Restricted Assets, Fair Value	21	13
Deferred Tax Liabilities, Gross	4,035	5,710
Long-term Debt, Fair Value	45,620	45,050
Impairment losses	895	897
Goodwill acquired	12	509
Goodwill	4,768	5,670	[1]	6,056
Long-term Debt	44,084	43,802
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0
Investment In Sunoco LP [Member]
Impairment losses	102
Goodwill, Impaired, Accumulated Impairment Loss		641
Goodwill acquired	0	81
Goodwill	1,430	1,550		1,694
Other Segments [Member]
Impairment losses	(452)
NGL and refined products transportation and services [Member]
Impairment losses	(79)
Midstream [Member]
Tangible Asset Impairment Charges		10
Impairment losses		(32)
Investment In ETP [Member]
Impairment losses	793	670
Goodwill acquired	12	428
Goodwill	3,115	3,897		5,428
Interstate Transportation and Storage [Member]
Impairment losses	(262)	(638)
Retail Marketing [Member]
Excise Taxes Collected	$ 234	243		$ 231
Continuing Operations [Member] | Investment In Sunoco LP [Member]
Impairment losses		$ 227
[1] * As adjusted. See Note 2.

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