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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 11 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2013
Selling, general and administrative expenses
Sep. 30, 2013
Selling, general and administrative expenses
Sep. 30, 2013
Interest and other expense/ (income)
Sep. 30, 2013
Interest and other expense/ (income)
Feb. 28, 2013
Indian Department of Central Excise Authority
Cadbury
Maximum
Dec. 31, 2013
Indian Department of Central Excise Authority
Cadbury
Maximum
Feb. 28, 2013
Indian Department of Central Excise Authority
Cadbury
Maximum
Loss Contingencies [Line Items]                  
Formal claim of notice presented for unpaid excise tax             $ 46 $ 20  
Tax penalties and interest expense               20 46
Income due to reversal of accrued liability under Tax Indemnity 385 385 336 336 49 49      
Income due to reversal of accrued liability under tax indemnity, net of tax $ 363