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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2013
Cadbury
Sep. 30, 2013
Cadbury
Sep. 30, 2013
U.K.
Sep. 30, 2013
U.K.
Dec. 31, 2014
Scenario, Forecast
Income Tax Contingency [Line Items]                    
Impact on provision for income tax, out-of-period adjustments $ 20   $ 15              
Estimated effective tax rate         20.00%         21.20%
Effective tax rate 16.50% 2.50% 12.50% 3.00%            
Total favorable discrete items 65 109 169 295            
Net favorable tax audit settlements and expirations of statutes of limitations 109 45   177            
Tax benefit from acquisition-related indemnity resolution           325 325      
Income tax benefits resulting from tax legislation enacted tax rate               88 88  
Tax benefits from business divestiture       $ 39