v3.25.2
Employee Benefits - Summary of Defined Benefit Plans Amount Recognized in Group's Financial Statements - Change in Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Gratuity | Defined Benefit Obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance $ (253) $ (216)
Interest Income (17) (15)
Benefits paid 22 19
Translation differences 7 4
Ending balance (294) (253)
Gratuity | Plan Assets    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance 249 214
Interest Income 18 15
Remeasurements - Returns on plan assets excluding amounts included in interest income 2 2
Employer contribution 77 40
Benefits paid (21) (18)
Translation differences (6) (4)
Ending balance 319 249
Pension | Defined Benefit Obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance (122) (112)
Interest Income (2) (2)
Employee contribution (4) (4)
Benefits paid 7 1
Translation differences (3)  
Ending balance (138) (122)
Pension | Plan Assets    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance 119 106
Interest Income 2 2
Remeasurements - Returns on plan assets excluding amounts included in interest income 7 2
Employer contribution 5 6
Employee contribution 4 4
Benefits paid (7) (1)
Translation differences 3  
Ending balance 133 119
Provident Fund | Defined Benefit Obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance (1,424) (1,281)
Interest Income (102) (92)
Employee contribution (199) (200)
Benefits paid 204 246
Translation differences 38 21
Ending balance (1,622) (1,424)
Provident Fund | Plan Assets    
Disclosure of net defined benefit liability (asset) [line items]    
Beginning balance 1,416 1,239
Interest Income 101 89
Remeasurements - Returns on plan assets excluding amounts included in interest income 29 28
Employer contribution 125 126
Employee contribution 199 200
Benefits paid (204) (246)
Translation differences (37) (20)
Ending balance $ 1,629 $ 1,416