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Acquisitions and Divestitures - Additional Information - 2014 Activity - Argentina Divestiture (Detail) - USD ($)
$ in Millions
9 Months Ended
Mar. 12, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of operations   $ 148 $ 390
Argentina [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of operations $ 800    
Liabilities assumed $ 52    
Debt assumed beginning date Jun. 30, 2013    
Loss from discontinued operations, net of tax $ 517