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Employee Benefits - Summary of Defined Benefit Plans (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]          
Defined benefit obligation at the beginning of the year ₨ (1,042)        
Remeasurement (loss)/gains          
Return on plan assets excluding interest income—(loss)/gain (513) ₨ (607) ₨ (501)    
Defined benefit obligation at the end of the year (2,930) (1,042)      
Present value of unfunded obligation       ₨ (2,930) ₨ (1,042)
Recognized asset/(liability) (2,930) (1,042)   (2,930) (1,042)
Plan assets [member]          
Disclosure of net defined benefit liability (asset) [line items]          
Defined benefit obligation at the beginning of the year 9,443 8,507      
Acquisitions 58 109      
Expected return on plan assets 589 558      
Employer contributions 383 254      
Benefits paid (95) (34)      
Remeasurement (loss)/gains          
Return on plan assets excluding interest income—(loss)/gain (76) 49      
Translation adjustment 233        
Defined benefit obligation at the end of the year 10,535 9,443 8,507    
Recognized asset/(liability) ₨ 10,535 ₨ 9,443 ₨ 8,507 ₨ 10,535 ₨ 9,443