For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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.

+ References

No definition available.

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Segment Information - Narrative (Details) $ in Millions	12 Months Ended
Segment Information - Narrative (Details) $ in Millions	Dec. 31, 2016 USD ($) Segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment	2
Revenues	$ (7,872)	$ (12,764)	$ (23,125)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0
Marketing, Gathering And Compression [Member]
Segment Reporting Information [Line Items]
Revenues	(4,584)	(7,373)	(12,225)
Oilfield Services [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	(516)
Oilfield Services [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues			544
Intersubsegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0
Intersubsegment Eliminations [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(3,750)	(4,372)	(9,109)
Intersubsegment Eliminations [Member] \| Marketing, Gathering And Compression [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	3,750	4,372	8,565
Intersubsegment Eliminations [Member] \| Oilfield Services [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 544
BP PLC [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	10.00%	14.00%
ExxonMobil [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage			12.00%