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Revenues and Accounts Receivable - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Minimum Volume Commitments [Line Items]
Contract liability	$ 318	$ 338
Minimum Volume Commitments
Minimum Volume Commitments [Line Items]
Counterparty deficiencies	54	62
Contract liability	35	40
Counterparty deficiencies unbilled and uncollected	19	$ 22
Crude Oil Sales Agreements Entered Into In Conjunction With Storage Arrangements And Future Inventory Exchanges
Minimum Volume Commitments [Line Items]
Contract liability	$ 130

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- Definition

[Line Items] for Contract With Customer, Asset And Liability [Table]

+ References

No definition available.

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Amount associated with deficiencies by counterparties of their contractual minimum commitments.

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- Definition

Amount that has yet to be billed or collected as of the balance sheet date associated with deficiencies by counterparties of their contractual minimum commitments.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044

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