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Financial Instruments - Summary of Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value of Recurring Basis (Detail) - Fair value measurements at reporting date using [member] - INR (₨)
₨ in Millions
Mar. 31, 2019
Mar. 31, 2018
Cash flow hedges [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets ₨ 3,149 ₨ 1,139
Fair value of financial liabilities (130) (1,276)
Level 2 [member] | Cash flow hedges [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 3,149 1,139
Fair value of financial liabilities (130) (1,276)
Derivative Assets - Others [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 1,955 134
Fair value of financial liabilities (1,180) (941)
Derivative Assets - Others [member] | Level 2 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 1,955 134
Fair value of financial liabilities (1,180) (941)
Investment in liquid and short-term mutual funds [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 13,960 46,438
Investment in liquid and short-term mutual funds [member] | Level 1 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 13,960 46,438
Investments in equity instruments [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 6,916 5,685
Investments in equity instruments [member] | Level 2 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 248  
Investments in equity instruments [member] | Level 3 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 6,668 5,685
Commercial paper, certificate of deposits and bonds [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 185,048 176,234
Commercial paper, certificate of deposits and bonds [member] | Level 1 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 6,865 1,951
Commercial paper, certificate of deposits and bonds [member] | Level 2 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets ₨ 178,183 ₨ 174,283