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Financial Instruments - Summary of Details of Assets and Liabilities Considered under Level 3 Classification (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance ₨ 760,640    
Ending balance 833,171 $ 12,045 ₨ 760,640
Beginning balance (275,294)    
Ending balance (262,418) $ (3,793) (275,294)
Level 3 [member] | Investments in equity instruments [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance 5,685   5,303
Additions 2,869   1,851
Payouts     0
Transferred to Investments accounted for using the equity method (647)   (357)
Disposal (1,341)    
Gain/loss recognized in foreign currency translation reserve 203   53
Gain/loss recognized in other comprehensive income (101)   (1,165)
Finance expense recognized in consolidated statement of income     0
Ending balance 6,668   5,685
Level 3 [member] | Derivative Assets - Others [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance     426
Payouts     0
Gain/loss recognized in consolidated statement of income     (426)
Finance expense recognized in consolidated statement of income     0
Level 3 [member] | Contingent consideration [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance     (339)
Additions 0   0
Disposal     164
Transferred to Investments accounted for using the equity method 0   0
Gain/loss recognized in consolidated statement of income     167
Gain/loss recognized in foreign currency translation reserve     (32)
Gain/loss recognized in other comprehensive income ₨ 0   0
Finance expense recognized in consolidated statement of income     ₨ 40