v3.25.2
Income Taxes - Additional Information (Details)
$ / shares in Units, ₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Mar. 31, 2024
USD ($)
$ / shares
Mar. 31, 2023
USD ($)
$ / shares
Income Taxes [Line Items]          
Income tax expense, reversal   $ (16)   $ 113 $ 13
Corporate statutory tax rate 25.17% 25.17% 34.94% 34.94% 34.94%
Tax effect due to non-taxable income for Indian tax purposes       $ 363 $ 362
Per share effect of tax incentives on both basic and diluted weighted average number of equity shares | $ / shares       $ 0.09 $ 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   $ 1,941   $ 1,292  
Deferred income tax assets, not recognized on accumulated losses   538   560  
Interest income   38   232  
Provision for income tax reversed amount   21   63  
Reduction of contingent liabilities   125   196  
Income Tax Authorities          
Income Taxes [Line Items]          
Income tax claims not acknowledged as debt ₨ 19,330 226 ₨ 27,940 335  
Amount paid to statutory authorities ₨ 41,990 $ 491 ₨ 87,430 $ 1,048  
UNITED STATES          
Income Taxes [Line Items]          
Branch profit tax 15.00% 15.00%      
Approximate branch net assets   $ 907      
Deferred tax liability on branch profit tax, net of tax credits   $ 31      
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%