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Financial Instruments - Summary of Remaining Contractual Maturities of Significant Financial Liabilities at Reporting Date (Detail) - INR (₨)
₨ in Millions
Mar. 31, 2019
Mar. 31, 2018
Disclosure of maturity analysis for significant financial liabilities [line items]    
Loans, borrowings and bank overdrafts ₨ 99,467 ₨ 138,259
Trade payables and accrued expenses 88,304 68,129
Derivative liabilities 1,310 2,217
Other liabilities 644 1,057
Loans, borrowings and bank overdrafts, undiscounted cash flows 102,755 142,659
Trade payables and accrued expenses, undiscounted cash flows 88,304 68,129
Derivative liabilities, undiscounted cash flows 1,310 2,217
Other liabilities, undiscounted cash flows 644 1,057
Not later than one year [member]    
Disclosure of maturity analysis for significant financial liabilities [line items]    
Loans, borrowings and bank overdrafts, undiscounted cash flows 73,559 95,466
Trade payables and accrued expenses, undiscounted cash flows 88,304 68,129
Derivative liabilities, undiscounted cash flows 1,310 2,210
Other liabilities, undiscounted cash flows 644 1,050
1-2 years [member]    
Disclosure of maturity analysis for significant financial liabilities [line items]    
Loans, borrowings and bank overdrafts, undiscounted cash flows 24,887 18,997
Derivative liabilities, undiscounted cash flows   7
Other liabilities, undiscounted cash flows   7
2-4 years [member]    
Disclosure of maturity analysis for significant financial liabilities [line items]    
Loans, borrowings and bank overdrafts, undiscounted cash flows ₨ 4,309 28,190
4-7 years [member]    
Disclosure of maturity analysis for significant financial liabilities [line items]    
Loans, borrowings and bank overdrafts, undiscounted cash flows   ₨ 6