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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, 2020
Mar. 31, 2019
Cash flow hedges [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets ₨ 1,382 ₨ 3,149
Fair value of financial liabilities (4,057) (130)
Level 2 [member] | Cash flow hedges [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 1,382 3,149
Fair value of financial liabilities (4,057) (130)
Derivative Assets - Others [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 1,643 1,955
Fair value of financial liabilities (3,312) (1,180)
Derivative Assets - Others [member] | Level 2 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 1,643 1,955
Fair value of financial liabilities (3,312) (1,180)
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 14,795 13,960
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 14,795 13,960
Investments in equity instruments [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 9,297 6,916
Investments in equity instruments [member] | Level 2 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 119 248
Investments in equity instruments [member] | Level 3 [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 9,178 6,668
Commercial paper, certificate of deposits and bonds [member]    
Disclosure of fair value measurement of assets and liabilities [line items]    
Fair value of financial assets 155,587 185,048
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 12,983 6,865
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 ₨ 142,604 ₨ 178,183