Investment in equity accounted investees (Details 3) ₨ in Millions, $ in Millions	12 Months Ended
Mar. 31, 2026 INR (₨)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 INR (₨)	Mar. 31, 2024 INR (₨)	Mar. 31, 2026 USD ($)
Investments accounted for using equity method [Line Items]
Carrying value of the Company's investment	₨ 5,673		₨ 4,811		$ 60
Company's share of profits for the year	134	$ 1	217	₨ 147
O2 Renewable Energy IX Private Limited [Member]
Investments accounted for using equity method [Line Items]
Carrying value of the Company's investment	339		308	11
Company's share of profits for the year	₨ (20)		₨ 0	₨ (1)

- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

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