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Acquisitions and Divestitures - 2015 Activity (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 28, 2015
Jun. 30, 2015
Apr. 30, 2015
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Percentage of ownership       100.00%      
Leasehold and property acquisitions       $ 19 $ 91    
Transaction, reorganization, and separation       $ 15 $ 54    
Australia [Member] | Woodside Sale [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from divestitures     $ 2,800        
Australia [Member] | Consortium Sale [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from divestitures   $ 1,900          
Loss on disposal   $ 1,300          
Upstream Assets [Member] | Australia [Member] | Woodside Sale [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from divestitures     1,400        
LNG Assets [Member] | Australia [Member] | Woodside Sale [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from divestitures     $ 1,400        
Wheatstone LNG [Member] | Australia [Member] | Oil and Gas Properties [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Loss on sale of upstream assets           $ 922  
Yara Pilbara Holdings Pty Limited [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Percentage of ownership 49.00%            
Proceed from sale of equity method investments $ 391            
Impairment on equity method investment             $ 148
Kitimat LNG [Member] | Canada [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Percentage of ownership     50.00%        
Proceeds form sale of operations     $ 854        
Kitimat LNG [Member] | Upstream Assets [Member] | Canada [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds form sale of operations     510        
Kitimat LNG [Member] | LNG Assets [Member] | Canada [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds form sale of operations     $ 344