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Bank balance - Details of Balance With Banks (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨) | Mar. 31, 2016 INR (₨)
--- | --- | --- | --- | ---
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | ₨ 23,300 |  |  |
Deposit Account | 21,625 |  | ₨ 24,902 | ₨ 35,531
Cash and cash equivalents | 44,925 | $ 690 | ₨ 52,710 | ₨ 99,049
Citibank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 12,144 |  |  |
Deposit Account | 1,007 |  |  |
Cash and cash equivalents | 13,151 |  |  |
HSBC [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 4,907 |  |  |
Deposit Account | 3,323 |  |  |
Cash and cash equivalents | 8,230 |  |  |
Deutsche Bank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Deposit Account | 4,500 |  |  |
Cash and cash equivalents | 4,500 |  |  |
Yes Bank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 53 |  |  |
Deposit Account | 4,216 |  |  |
Cash and cash equivalents | 4,269 |  |  |
ANZ Bank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 232 |  |  |
Deposit Account | 3,845 |  |  |
Cash and cash equivalents | 4,077 |  |  |
HDFC Bank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 517 |  |  |
Deposit Account | 2,150 |  |  |
Cash and cash equivalents | 2,667 |  |  |
Saudi British Bank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 100 |  |  |
Deposit Account | 1,651 |  |  |
Cash and cash equivalents | 1,751 |  |  |
Wells Fargo Bank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 1,400 |  |  |
Cash and cash equivalents | 1,400 |  |  |
Standard Chartered Bank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 706 |  |  |
Cash and cash equivalents | 706 |  |  |
ICICI Bank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 12 |  |  |
Deposit Account | 602 |  |  |
Cash and cash equivalents | 614 |  |  |
Silicon Valley Bank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 331 |  |  |
Cash and cash equivalents | 331 |  |  |
IOB [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Deposit Account | 292 |  |  |
Cash and cash equivalents | 292 |  |  |
Unicredit Bank Austria A G [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 192 |  |  |
Cash and cash equivalents | 192 |  |  |
Bank of Montreal [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 192 |  |  |
Cash and cash equivalents | 192 |  |  |
BNP Paribas [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 156 |  |  |
Cash and cash equivalents | 156 |  |  |
Kreissparkasse [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 135 |  |  |
Cash and cash equivalents | 135 |  |  |
Rabobank [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 66 |  |  |
Cash and cash equivalents | 66 |  |  |
State Bank of India [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 65 |  |  |
Cash and cash equivalents | 65 |  |  |
Bradesco SA [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 56 |  |  |
Deposit Account | 3 |  |  |
Cash and cash equivalents | 59 |  |  |
Funds in Transit [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 1,134 |  |  |
Cash and cash equivalents | 1,134 |  |  |
Other [member] |  |  |  |
Disclosure of Bank Deposits [Line Items] |  |  |  |
Current Account | 902 |  |  |
Deposit Account | 36 |  |  |
Cash and cash equivalents | ₨ 938 |  |  |

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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 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_i&doctype=Standard -URIDate 2017-03-09 + Details
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