Segment Information - Table (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating Revenues	$ 2,753	$ 1,953
Intersegment Revenues	0	0
Revenues	2,753	1,953
Income (Loss) Before Income Taxes	142	(1,068)
TOTAL ASSETS	11,699		$ 13,028
Scenario, Previously Reported [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes		(921)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(1,120)	(783)
Intersegment Revenues	1,120	783
Revenues	0	0
Income (Loss) Before Income Taxes	(29)	(57)
TOTAL ASSETS	(397)		(398)
Intersegment Eliminations [Member] \| Scenario, Previously Reported [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes		(57)
Exploration And Production [Member]
Segment Reporting Information [Line Items]
Revenues	1,469	993
Exploration And Production [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Revenues	1,469	993
Intersegment Revenues	0	0
Income (Loss) Before Income Taxes	567	(1,042)
TOTAL ASSETS	10,147		11,249
Exploration And Production [Member] \| Operating Segments [Member] \| Scenario, Previously Reported [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes		(895)
Marketing, Gathering And Compression [Member]
Segment Reporting Information [Line Items]
Revenues	1,284	960
Marketing, Gathering And Compression [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Revenues	2,404	1,743
Intersegment Revenues	(1,120)	(783)
Income (Loss) Before Income Taxes	(386)	40
TOTAL ASSETS	918		1,118
Marketing, Gathering And Compression [Member] \| Operating Segments [Member] \| Scenario, Previously Reported [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes		40
Other Segments [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Other Segments [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Revenues	0	0
Intersegment Revenues	0	0
Income (Loss) Before Income Taxes	(10)	(9)
TOTAL ASSETS	$ 1,031		$ 1,059
Other Segments [Member] \| Operating Segments [Member] \| Scenario, Previously Reported [Member]
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes		$ (9)

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount, after sales adjustments, returns, allowances, and discounts, of revenue classified as other.

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Aggregate revenue from the sale of minerals and related products, and from rendering services such as exploration, development, mining, processing and providing mining support activities.

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