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Income Taxes - Additional Information Regarding Examinations (Detail) - USD ($)
$ in Billions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Mar. 31, 2011
Mar. 31, 2017
Jun. 30, 2016
Income Tax Examination [Line Items]        
Tax contingencies and other tax liabilities     $ 14.4 $ 11.8
Earliest Tax Year | Foreign Country        
Income Tax Examination [Line Items]        
Tax years subject to examination     1996  
Latest Tax Year | Foreign Country        
Income Tax Examination [Line Items]        
Tax years subject to examination     2017  
Internal Revenue Service (IRS) | Earliest Tax Year        
Income Tax Examination [Line Items]        
Tax years under audit 2007 2004    
Tax years subject to examination     2010  
Internal Revenue Service (IRS) | Latest Tax Year        
Income Tax Examination [Line Items]        
Tax years under audit 2009 2006    
Tax years subject to examination     2016