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Accumulated other comprehensive income (Tables) | 12 Months Ended
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Mar. 31, 2022
Changes in Accumulated Other Comprehensive Income After Tax | The below table presents the changes in accumulated other comprehensive income (“OCI”) after income tax for the years ended March 31, 2021 and March 31, 2022.
|  | Available for sale securities |  |  | Foreign currency translation reserve |  |  | Total |
|  | (In millions) |
Balance, March 31, 2020 |  | Rs. | 49,225.4 |  |  | Rs. | 3,106.2 |  |  | Rs. | 52,331.6 |
Net unrealized gain/(loss) arising during the period |  |  | (740.6 | ) |  |  | (1,132.8 | ) |  |  | (1,873.4 | )
Amounts reclassified to income |  |  | (23,271.9 | ) |  |  | — |  |  |  | (23,271.9 | )
Balance, March 31, 2021 |  | Rs. | 25,212.9 |  |  | Rs. | 1,973.4 |  |  | Rs. | 27,186.3 |
Balance, March 31, 2021 |  | Rs. | 25,212.9 |  |  | Rs. | 1,973.4 |  |  | Rs. | 27,186.3 |
Net unrealized gain/(loss) arising during the period |  |  | (36,088.6 | ) |  |  | 1,297.5 |  |  |  | (34,791.1 | )
Amounts reclassified to income |  |  | (10,187.7 | ) |  |  | — |  |  |  | (10,187.7 | )
Balance, March 31, 2022 |  | Rs. | (21,063.4 | ) |  | Rs. | 3,270.9 |  |  | Rs. | (17,792.5 | )
Balance, March 31, 2022 |  | US$ | (277.6 | ) |  | US$ | 43.1 |  |  | US$ | (234.5 | )
Reclassification Out of Accumulated Other Comprehensive Income (OCI) by Income line Item and the Related Tax Effect | The below table presents the reclassification out of accumulated other comprehensive income (OCI) by income line item and the related income tax effect for years ended March 31, 2021 and March 31, 2022.
|  | As of March 31, |
|  | 2021 |  |  | 2022 |  |  | 2022 |
|  | (In millions) |
Available for sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
Realized (gain)/loss on sales of available for sale debt securities, net |  | Rs. | (34,014.8 | ) |  | Rs. | (10,699.4 | ) |  | US$ | (141.0 | )
Allowance on available for sale debt securities |  |  | 2,915.1 |  |  |  | (2,915.1 | ) |  |  | (38.4 | )
Total before income tax |  | Rs. | (31,099.7 | ) |  | Rs. | (13,614.5 | ) |  | US$ | (179.4 | )
Income tax |  |  | 7,827.8 |  |  |  | 3,426.8 |  |  |  | 45.1 |
Net of income tax |  | Rs. | (23,271.9 | ) |  | Rs. | (10,187.7 | ) |  | US$ | (134.3 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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