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Bank balance - Details of Balance With Banks (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2020 INR (₨) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨) | Mar. 31, 2018 INR (₨)
--- | --- | --- | --- | ---
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | ₨ 34,087 |  |  |
Deposit Account | 110,412 |  | ₨ 116,563 | ₨ 21,625
Cash and cash equivalents | 144,499 | $ 1,917 | ₨ 158,529 | ₨ 44,925
HDFC Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 599 |  |  |
Deposit Account | 35,670 |  |  |
Cash and cash equivalents | 36,269 |  |  |
ICICI Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Deposit Account | 34,883 |  |  |
Cash and cash equivalents | 34,883 |  |  |
Citibank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 18,902 |  |  |
Deposit Account | 7,247 |  |  |
Cash and cash equivalents | 26,149 |  |  |
Axis Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 1 |  |  |
Deposit Account | 22,988 |  |  |
Cash and cash equivalents | 22,989 |  |  |
HSBC [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 6,729 |  |  |
Deposit Account | 4,672 |  |  |
Cash and cash equivalents | 11,401 |  |  |
Saudi British Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 955 |  |  |
Deposit Account | 3,311 |  |  |
Cash and cash equivalents | 4,266 |  |  |
Wells Fargo Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 2,627 |  |  |
Cash and cash equivalents | 2,627 |  |  |
Kotak Mahindra Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 2 |  |  |
Deposit Account | 1,200 |  |  |
Cash and cash equivalents | 1,202 |  |  |
BNP Paribas [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 1,034 |  |  |
Cash and cash equivalents | 1,034 |  |  |
ANZ Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 426 |  |  |
Deposit Account | 302 |  |  |
Cash and cash equivalents | 728 |  |  |
Deutsche Bank [Member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 496 |  |  |
Cash and cash equivalents | 496 |  |  |
Standard Chartered Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 341 |  |  |
Cash and cash equivalents | 341 |  |  |
UniCredit Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 334 |  |  |
Cash and cash equivalents | 334 |  |  |
JP Morgan Chase [Member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 107 |  |  |
Deposit Account | 139 |  |  |
Cash and cash equivalents | 246 |  |  |
MUFG Bank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 132 |  |  |
Cash and cash equivalents | 132 |  |  |
Rabobank [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 129 |  |  |
Cash and cash equivalents | 129 |  |  |
Silicon Valley Bank [Member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 109 |  |  |
Cash and cash equivalents | 109 |  |  |
United Amara Bank [Member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 259 |  |  |
Cash and cash equivalents | 259 |  |  |
Intesa San Paolo [Member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 108 |  |  |
Cash and cash equivalents | 108 |  |  |
Other [member] |  |  |  |
Disclosure of Bank Deposits [line items] |  |  |  |
Current Account | 797 |  |  |
Cash and cash equivalents | ₨ 797 |  |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition These deposits can be withdrawn by the Company at any time without prior notice and without any penalty on the principal. + References No definition available. + Details
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