The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Goodwill - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended
Goodwill - Additional Information (Detail) $ in Millions	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Segment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Goodwill [Line Items]
Number of operating segments for the Corporation \| Segment			2
Number of reporting units \| Segment			2
GOODWILL	$ 1,473		$ 1,473		$ 1,858
Impairment	385	$ 0	385	$ 0
Impairment after income taxes			385
Exploration and Production [Member]
Goodwill [Line Items]
GOODWILL	1,098		1,098		1,858
Impairment			385
Exploration and Production [Member] \| Offshore Reporting Units [Member]
Goodwill [Line Items]
GOODWILL	1,098		1,098
Exploration and Production [Member] \| Onshore Reporting Units [Member]
Goodwill [Line Items]
GOODWILL					$ 760
Bakken Midstream [Member]
Goodwill [Line Items]
GOODWILL	$ 375		$ 375
Percentage of interest sold in joint venture	50.00%		50.00%