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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 |

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