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Other Liabilities and Provisions - Summary of Activity for Provision for Warranty and Other Provisions (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of other provisions [line items]    
Balance at the beginning of the year ₨ 1,274 ₨ 1,276
Additional provision during the year 324 800
Provision used during the year (799) (802)
Balance at the end of the year 799 1,274
Provision for warranty [member]    
Disclosure of other provisions [line items]    
Balance at the beginning of the year 440 402
Additional provision during the year 317 631
Provision used during the year (464) (593)
Balance at the end of the year 293 440
Other provisions [member]    
Disclosure of other provisions [line items]    
Balance at the beginning of the year 834 874
Additional provision during the year 7 169
Provision used during the year (335) (209)
Balance at the end of the year ₨ 506 ₨ 834