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Goodwill and Intangible Assets - Summary of Allocation of Goodwill to CGUs (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Disclosure of information for cash-generating units [line items]        
Goodwill ₨ 116,980 $ 1,691 ₨ 117,584 ₨ 125,796
Banking Financial Services and Insurance (BFSI) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 17,713   17,475  
Healthcare and Lifesciences (HLS) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 50,670   49,085  
Consumer Business Unit (CBU) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 13,587   14,776  
Energy, Natural Resources and Utilities (ENU) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 15,203   14,863  
Manufacturing and Technology (MNT) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill     20,406  
Communications (COMM) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 970   ₨ 979  
Manufacturing Segment [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 8,991      
Technology segment [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill ₨ 9,846