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Commitments and Contingencies - Additional Information (Detail)
₨ in Billions
 3 Months Ended 12 Months Ended
Sep. 30, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
INR (₨)
Loss Contingencies [Line Items]          
Income due to reversal of accrued liability under Tax Indemnity $ 385,000,000     $ 385,000,000  
Income due to reversal of accrued liability under tax indemnity, net of tax 363,000,000        
Rental expenses   $ 331,000,000 $ 399,000,000 386,000,000  
Selling, general and administrative expenses          
Loss Contingencies [Line Items]          
Income due to reversal of accrued liability under Tax Indemnity 336,000,000     $ 336,000,000  
Interest and other expense / (income)          
Loss Contingencies [Line Items]          
Income due to reversal of accrued liability under Tax Indemnity $ 49,000,000        
Indian Department of Central Excise Authority | Cadbury          
Loss Contingencies [Line Items]          
Amount for formal claim of notice presented for unpaid excise tax, as of the balance sheet date   57,000,000     ₨ 3.7
Indian Department of Central Excise Authority | Cadbury | Show case notice          
Loss Contingencies [Line Items]          
Amount for formal claim of notice presented for unpaid excise tax, as of the balance sheet date   36,000,000     2.4
Indian Department of Central Excise Authority | Cadbury | Maximum          
Loss Contingencies [Line Items]          
Tax penalties and interest expense   $ 88,000,000     ₨ 5.8
U.S. Commodity Futures Trading Commission ("CFTC")          
Loss Contingencies [Line Items]          
Loss contingency, filling date   April 1, 2015      
Loss contingency, damages sought   $ 1,000,000      
U.S. Commodity Futures Trading Commission ("CFTC") | Each Additional Violation of the Commodity Exchange Act          
Loss Contingencies [Line Items]          
Loss contingency, damages sought   $ 140,000