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Goodwill and Intangible Assets - Summary of Allocation of Goodwill to CGUs (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Disclosure of information for cash-generating units [line items]        
Goodwill ₨ 131,012 $ 1,738 ₨ 116,980 ₨ 117,584
Banking Financial Services and Insurance (BFSI) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 19,225   17,713  
Healthcare and Life Sciences (Health BU) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 55,642   50,670  
Consumer Business Unit (CBU) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 14,501   13,587  
Energy, Natural Resources and Utilities (ENU) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 15,782   15,203  
Communications (COMM) [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 1,043   970  
Manufacturing Segment [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill 11,998   8,991  
Technology segment [member]        
Disclosure of information for cash-generating units [line items]        
Goodwill ₨ 12,821   ₨ 9,846