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Employee Benefits - Summary of Defined Benefit Plans (Detail) - INR (₨)
₨ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]          
Defined benefit obligation at the beginning of the year ₨ (147)        
Present value of unfunded obligation       ₨ (1,042) ₨ (147)
Recognized asset/(liability) (147) ₨ (147)   (1,042) (147)
Re-measurement of net defined benefit liability/(asset)          
Return on plan assets excluding interest income (607) (501) ₨ (692)    
Defined benefit obligation at the end of the year (1,042) (147)      
Plan assets [member]          
Disclosure of net defined benefit liability (asset) [line items]          
Defined benefit obligation at the beginning of the year 8,507 7,919      
Acquisitions (Note 32) 109 28      
Recognized asset/(liability) 8,507 7,919 7,919 ₨ 9,443 ₨ 8,507
Expected return on plan assets 558 483      
Employer contributions 254 59      
Benefits paid (34)        
Re-measurement of net defined benefit liability/(asset)          
Return on plan assets excluding interest income 49 18      
Defined benefit obligation at the end of the year ₨ 9,443 ₨ 8,507 ₨ 7,919