Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tangible Asset Impairment Charges	$ 133	$ 110
ARO Underlying Asset	14	18
Impairment of Intangible Assets, Finite-lived		24
Asset Retirement Obligation, Legally Restricted Assets, Fair Value	13	6
Deferred Tax Liabilities, Gross	5,710	4,945
Long-term Debt, Fair Value	45,050	33,220
Impairment losses	826	205
Goodwill acquired	509	23
Goodwill	5,170	5,485	$ 5,871
Long-term Debt	43,802	36,968
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	0
Midstream [Member]
Tangible Asset Impairment Charges	10
Impairment losses	(32)
Investment In ETP [Member]
Impairment losses	670	205
Goodwill acquired	428	0
Goodwill	3,897	5,428	7,642
NGL and refined products transportation and services [Member]
Impairment losses		(106)
Interstate Transportation and Storage [Member]
Impairment losses	(638)	(99)
Retail Marketing [Member]
Excise Taxes Collected	$ 3,480	$ 3,050	$ 2,460

The balance of the asset underlying the Company's asset retirement obligation

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Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.

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Amount of deferred tax liability attributable to taxable temporary differences.

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The excise taxes collected by a public utility and reported in revenues if the amount of excise taxes is equal to 1 percent or more of such total.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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