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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, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance ₨ 833,171    
Ending balance 817,062 $ 10,838 ₨ 833,171
Level 3 [member] | Investments in equity instruments [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Beginning balance 6,668   5,685
Additions 2,124   2,869
Transferred to Investments accounted for using the equity method     (647)
Disposal (1,327)   (1,341)
Gain recognized in foreign currency translation reserve 855   203
Gain/loss recognized in other comprehensive income 858   (101)
Ending balance ₨ 9,178   ₨ 6,668