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Commitments and Contingencies - Additional Information (Detail) - 3 months ended Mar. 31, 2017
₨ in Billions
USD ($)
INR (₨)
Loss Contingencies [Line Items]    
Income due to reversal of accrued liability under tax indemnity $ 58,000,000  
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 58,000,000 ₨ 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 37,000,000 2.4
Indian Department of Central Excise Authority | Cadbury | Maximum    
Loss Contingencies [Line Items]    
Tax penalties and interest expense 90,000,000 ₨ 5.8
Selling, general and administrative expenses    
Loss Contingencies [Line Items]    
Income due to reversal of accrued liability under tax indemnity 46,000,000  
Interest and Other Expense    
Loss Contingencies [Line Items]    
Income due to reversal of accrued liability under tax indemnity $ 12,000,000  
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