Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The liability due as of the balance sheet date for leasebacks accounted for using the deposit method.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Term of the entity's agreement renewal option that may be requested.

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Represents the number of times an entity may request to renew or extend the term of an agreement or contract.

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Commitments and Contingencies (Details) bbl in Millions, $ in Millions	1 Months Ended	9 Months Ended		21 Months Ended	27 Months Ended
	Sep. 30, 2017 USD ($) bbl / d renewal bbl	Sep. 30, 2017 USD ($) bbl / d renewal bbl	Sep. 30, 2016 USD ($)	Jun. 30, 2019 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2016 USD ($)
Commitments and Contingencies (Textual)
MVP Terminal construction costs	$ 39,527	$ 39,527				$ 37,733
Contributions made or expected to be made to MVP		373	$ 0
Estimated cost of undivided interest in pipeline		72	0
Estimated construction costs		$ 913	$ 912
Terminalling Agreement [Member] \| MVP Terminalling, LLC (MVP) [Member]
Commitments and Contingencies (Textual)
Initial term of terminal agreement	12 years
Number of available automatic renewals \| renewal	2	2
Automatic renewal term of terminalling agreement	5 years
Minimum [Member]
Commitments and Contingencies (Textual)
Range of possible loss contingency	$ 0	$ 0
Maximum [Member]
Commitments and Contingencies (Textual)
Range of possible loss contingency	$ 200	$ 200
MVP Terminal [Member]
Commitments and Contingencies (Textual)
Approximate storage capacity of terminal (in barrels) \| bbl	5	5
Contributions made or expected to be made to MVP	$ 77
MVP Terminal [Member] \| Magellan Midstream Partners LP (Magellan) [Member]
Commitments and Contingencies (Textual)
Long-term liability recorded	55	$ 55
MVP Terminal [Member] \| Construction in Progress [Member]
Commitments and Contingencies (Textual)
MVP Terminal construction costs	$ 110	$ 110
MVP Terminal [Member] \| Expected [Member]
Commitments and Contingencies (Textual)
Contributions made or expected to be made to MVP					$ 420
MVP Terminal [Member] \| Expected [Member] \| Minimum [Member] \| Construction in Progress [Member]
Commitments and Contingencies (Textual)
MVP Terminal construction costs					840
MVP Terminal [Member] \| Expected [Member] \| Maximum [Member] \| Construction in Progress [Member]
Commitments and Contingencies (Textual)
MVP Terminal construction costs					$ 1,400
MVP Terminal [Member] \| Valero Energy Corporation [Member]
Commitments and Contingencies (Textual)
Approximate storage capacity of terminal (in barrels) \| bbl	4	4
Central Texas Pipeline [Member]
Commitments and Contingencies (Textual)
Undivided interest in project (percent)	40.00%	40.00%
Pipeline capacity (in barrels per day) \| bbl / d	150,000	150,000
Central Texas Pipeline [Member] \| Expected [Member]
Commitments and Contingencies (Textual)
Estimated cost of undivided interest in pipeline				$ 170
Hearne and Williamson Terminals and Pipeline [Member]
Commitments and Contingencies (Textual)
Pipeline capacity (in barrels per day) \| bbl / d	60,000	60,000
Hearne and Williamson Terminals and Pipeline [Member] \| Expected [Member]
Commitments and Contingencies (Textual)
Estimated construction costs				$ 210
Variable Interest Entity, Not Primary Beneficiary [Member] \| MVP Terminalling, LLC (MVP) [Member]
Commitments and Contingencies (Textual)
Membership percentage in VIE (percent)	50.00%