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Goodwill and Intangible Assets - Summary of Allocation of Goodwill to CGUs (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Disclosure of information for cash-generating units [line items]        
Goodwill ₨ 117,584 $ 1,806 ₨ 125,796 ₨ 101,991
Banking Financial Services and Insurance (BFSI) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 17,475   19,826  
Healthcare and Lifesciences (HLS) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 49,085   48,144  
Consumer Business Unit (CBU) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 14,776   17,442  
Energy, Natural Resources and Utilities (ENU) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 14,863   16,393  
Manufacturing and Technology (MNT) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 20,406   23,086  
Communications (COMM) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill ₨ 979   ₨ 905