v3.26.1
Income Taxes - Additional Information (Details)
$ / shares in Units, ₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
$ / shares
Income Taxes [Line Items]          
Income tax expense, reversal   $ 93   $ (16) $ 113
Corporate statutory tax rate 25.17% 25.17% 25.17% 25.17% 34.94%
Tax effect due to non-taxable income for Indian tax purposes         $ 363
Per share effect of tax incentives on both basic and diluted weighted average number of equity shares | $ / shares         $ 0.09
Percentage of reduced rate of corporate tax 22.00% 22.00%      
Percenatge of surcharge 10.00% 10.00%      
Percentage of cess 4.00% 4.00%      
Deferred income tax liabilities not recognized amount of temporary differences   $ 2,032   $ 1,941  
Deferred income tax assets, not recognized on accumulated losses   513   538  
Interest income   41   38 $ 232
Provision for income tax reversed amount   93   21 63
Reduction of contingent liabilities   9   125 $ 196
Income Tax Authorities          
Income Taxes [Line Items]          
Income tax claims not acknowledged as debt ₨ 19,640 207 ₨ 19,330 226  
Amount paid to statutory authorities ₨ 25,940 $ 273 ₨ 41,990 $ 491  
UNITED STATES          
Income Taxes [Line Items]          
Branch profit tax 15.00% 15.00%      
Approximate branch net assets   $ 816      
Deferred tax liability on branch profit tax, net of tax credits   $ 22      
First Five Year          
Income Taxes [Line Items]          
Percentage of tax reduction 100.00% 100.00%      
Second Five Year | Top of Range          
Income Taxes [Line Items]          
Percentage of tax reduction 50.00% 50.00%      
Third Five Year | Top of Range          
Income Taxes [Line Items]          
Percentage of tax reduction 50.00% 50.00%