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Inventories Textual (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Apr. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Inventory [Line Items]
LIFO Inventory Amount		$ 283	$ 341
Excess of Replacement or Current Costs over Stated LIFO Value		100	$ 124
Conoco Phillips Vs Petroleos de Venezuela SA [Member]
Inventory [Line Items]
Litigation Settlement, Amount Awarded from Other Party	$ 2,000
Inventory Exchanges [Member] | Conoco Phillips Vs Petroleos de Venezuela SA [Member]
Inventory [Line Items]
Litigation Settlement, Amount Awarded from Other Party		$ 139

X

- Definition

The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(c))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- 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.

+ References

No definition available.

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- Definition

The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766

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- Definition

Amount awarded from other party in judgment or settlement of litigation.

+ References

No definition available.

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