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Loans, Borrowings and Bank Overdrafts - Summary of Changes in Financing Liabilities Arising from Cash and Non-cash Changes (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance ₨ 99,467 ₨ 138,259
Cash flow (32,431) (42,873)
Non cash changes, assets taken on finance lease   14
Non cash changes, foreign exchange movements 6,883 4,067
Non cash changes, IFRS 16 adoption 15,379  
Non cash changes, Additions to lease liabilities 7,942  
Ending balance 97,240 99,467
Borrowings from banks [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 96,979 119,689
Cash flow (26,138) (26,228)
Non cash changes, foreign exchange movements 6,217 3,518
Ending balance 77,058 96,979
Bank overdrafts [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 4 3,999
Cash flow 391 (3,995)
Ending balance 395 4
External commercial borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance   9,777
Cash flow   (10,064)
Non cash changes, foreign exchange movements   287
Obligations under finance leases [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 2,002 3,973
Cash flow   (2,234)
Non cash changes, assets taken on finance lease   14
Non cash changes, foreign exchange movements   249
Non cash changes, IFRS 16 adoption (2,002)  
Ending balance   2,002
Loans from other than bank [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance 482 821
Cash flow 100 (352)
Non cash changes, foreign exchange movements 7 13
Ending balance 589 ₨ 482
Lease liabilities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Cash flow (6,784)  
Non cash changes, foreign exchange movements 659  
Non cash changes, IFRS 16 adoption 17,381  
Non cash changes, Additions to lease liabilities 7,942  
Ending balance ₨ 19,198