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Related-Party Transactions (Schedule of Related Party Transactions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Motor fuel sales to affiliates	$ 55	$ 62	$ 20
Bulk fuel purchases from ETP	2,416	1,867	$ 2,449
Receivables from affiliates	155	3
Accounts payable to affiliates	$ 206	$ 109

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- Definition

Payable Bulk Fuel Purchases from ETP

+ References

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- Definition

Revenue from the wholesale sale and distribution of motor fuel to affiliates.

+ References

No definition available.

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- Definition

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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