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Acquisitions and Divestitures - Summary of Sales and Other Operating Revenue and Loss From Discontinued Operation Related to Disposition (Detail) (Argentina Divestiture [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Argentina Divestiture [Member]
       
Discontinued Operations [Line Items]        
Revenues and other from discontinued operations $ 0 $ 118 $ 87 $ 364
Loss from Argentina divestiture 0   (539)  
Loss from operations in Argentina 0 (129) (1) (192)
Income tax benefit 0   23  
Loss from discontinued operations, net of tax $ 0 $ (129) $ (517) $ (192)