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Commitments and Contingencies - Additional Information (Detail)
₨ in Billions
 1 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
INR (₨)
Loss Contingencies [Line Items]          
Rental expenses   $ 317,000,000 $ 331,000,000 $ 399,000,000  
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   55,000,000     ₨ 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   35,000,000     2.4
Indian Department of Central Excise Authority | Cadbury | Maximum          
Loss Contingencies [Line Items]          
Tax penalties and interest expense   $ 86,000,000     ₨ 5.8
Subsequent Event          
Loss Contingencies [Line Items]          
Civil penalty payment $ 13,000,000        
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