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Accumulated other comprehensive income (Tables) | 12 Months Ended
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Mar. 31, 2025
Summary of Changes in Accumulated Other Comprehensive Income After Tax | The below table presents the changes in AOCI after income tax for the fiscal years ended March 31, 2024 and March 31, 2025.
|  | AFS debt securities |  |  | Foreign currency translation reserve |  |  | Long-Duration Insurance Contract |  |  | Total |
|  | (In millions) |
Balance, March 31, 2023 |  | Rs. | (74,923.1 | ) |  | Rs. | 6,649.4 |  |  | Rs. | — |  |  | Rs. | (68,273.7 | )
Net unrealized gain/ (loss) arising during the period |  |  | 78,036.1 |  |  |  | 810.3 |  |  |  | — |  |  |  | 78,846.4 |
Amounts reclassified to income |  |  | 4,856.3 |  |  |  | — |  |  |  | — |  |  |  | 4,856.3 |
Long-duration insurance contract discount rate change |  |  | — |  |  |  | — |  |  |  | (34,112.6 | ) |  |  | (34,112.6 | )
Transferred to undistributed policyholders earnings account |  |  | — |  |  |  | — |  |  |  | 3,391.4 |  |  |  | 3,391.4 |
Less: Other comprehensive income attributable to shareholders of noncontrolling interest |  |  | 15,474.5 |  |  |  | 17.9 |  |  |  | (15,244.2 | ) |  |  | 248.2 |
Balance, March 31, 2024 |  | Rs. | (7,505.2 | ) |  | Rs. | 7,441.8 |  |  | Rs. | (15,477.0 | ) |  | Rs. | (15,540.4 | )
|  | AFS debt securities |  |  | Foreign currency translation reserve |  |  | Long-Duration Insurance Contract |  |  | Total |
|  | (In millions) |
Balance, March 31, 2024 |  | Rs. | (7,505.2 | ) |  | Rs. | 7,441.8 |  |  | Rs. | (15,477.0 | ) |  | Rs. | (15,540.4 | )
Net unrealized gain/ (loss) arising during the period |  |  | 145,589.7 |  |  |  | 2,004.3 |  |  |  | — |  |  |  | 147,594.0 |
Amounts reclassified to income |  |  | 9,835.5 |  |  |  | — |  |  |  | — |  |  |  | 9,835.5 |
Long-duration insurance contract discount rate change |  |  | — |  |  |  | — |  |  |  | (59,827.6 | ) |  |  | (59,827.6 | )
Transferred to undistributed policyholders earnings account |  |  | (58,778.7 | ) |  |  | — |  |  |  | 75,304.6 |  |  |  | 16,525.9 |
Less: Other comprehensive income attributable to shareholders of noncontrolling interest |  |  | 1,361.3 |  |  |  | 32.0 |  |  |  | — |  |  |  | 1,393.3 |
Balance, March 31, 2025 |  | Rs. | 87,780.0 |  |  | Rs. | 9,414.1 |  |  | Rs. | — |  |  | Rs. | 97,194.1 |
Balance, March 31, 2025 |  | US$ | 1,027.5 |  |  | US$ | 110.2 |  |  | US$ | — |  |  | US$ | 1,137.7 |
Summary of 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 AOCI by income line item and the related income tax effect for the fiscal years ended March 31, 2024 and March 31, 2025.
|  | As of March 31, |
|  | 2024 |  |  | 2025 |  |  | 2025 |
|  | (In millions) |
AFS debt securities: |  |  |  |  |  |  |  |  |  |  |  |
Realized (gain)/loss on sales of AFS debt securities, net |  | Rs. | 6,602.9 |  |  | Rs. | 13,418.4 |  |  | US$ | 157.0 |
Allowance on AFS debt securities |  |  | (70.9 | ) |  |  | — |  |  |  | — |
Total before income tax |  | Rs. | 6,532.0 |  |  | Rs. | 13,418.4 |  |  | US$ | 157.0 |
Income tax |  |  | (1,675.7 | ) |  |  | (3,582.9 | ) |  |  | (41.9 | )
Net of income tax |  | Rs. | 4,856.3 |  |  | Rs. | 9,835.5 |  |  | US$ | 115.1 |

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