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Goodwill and Intangible Assets - Summary of Allocation of Goodwill to CGUs (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨) | Mar. 31, 2018 INR (₨)
--- | --- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | ₨ 131,012 | $ 1,738 | ₨ 116,980 | ₨ 117,584
Banking Financial Services and Insurance (BFSI) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 19,225 |  | 17,713 |
Healthcare and Life Sciences (Health BU) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 55,642 |  | 50,670 |
Consumer Business Unit (CBU) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 14,501 |  | 13,587 |
Energy, Natural Resources and Utilities (ENU) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 15,782 |  | 15,203 |
Communications (COMM) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 1,043 |  | 970 |
Manufacturing Segment [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 11,998 |  | 8,991 |
Technology segment [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | ₨ 12,821 |  | ₨ 9,846 |

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