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Acquisitions and Divestitures - Summary of Sales and Other Operating Revenue and Loss From Discontinued Operation Related to Disposition - Australia Divestitures (Detail) - Australia [Member] - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Consortium Sale [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss from divestiture $ (1,300)        
Australia Divestiture [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Revenues and other from discontinued operations   $ 101 $ 195 $ 288 $ 482
Income (loss) from divested operations   (11) 68 24 217
Income tax benefit (expense)   1,530 (12) 1,363 (60)
Income (Loss) from discontinued operations, net of tax   (732) $ 56 (864) $ 157
Australia Divestiture [Member] | Woodside Sale [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss from divestiture   (922)   (922)  
Australia Divestiture [Member] | Consortium Sale [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss from divestiture   $ (1,329)   $ (1,329)