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Acquisitions and Divestitures - Additional Information - 2014 Activity - Argentina Divestiture (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 12, 2014
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of oil and gas assets   $ 1,200 $ 268 $ 470 $ 307
Argentina [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of oil and gas assets $ 800        
Liabilities assumed $ 52        
Debt assumed beginning date Jun. 30, 2013