v3.25.2
Employee Benefits - Summary of Defined Benefit Plans Amount Recognized in Group's Financial Statements - Change in Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Gratuity      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Remeasurements - Actuarial losses / (gains) $ 12 $ 4 $ (9)
Funded status surplus/(deficit) 25 (4)  
Defined benefit plan asset 33 2  
Net defined benefit asset/ (liability)(Refer note 2.5) (8) (6)  
Gratuity | Defined Benefit Obligations      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 253 216  
Transfer 1 4  
Service cost 40 37  
Interest expense/income 17 15  
Remeasurements - Actuarial losses / (gains) 12 4  
Ending balance 294 253 216
Benefits paid (22) (19)  
Translation differences (7) (4)  
Irrecoverable surplus - effect of asset ceiling 294 253 216
Gratuity | Plan Assets      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance (249) (214)  
Interest expense/income (18) (15)  
Ending balance (319) (249) (214)
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  
Irrecoverable surplus - effect of asset ceiling (319) (249) (214)
Pension      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Remeasurements - Actuarial losses / (gains) 8 3 (17)
Funded status surplus/(deficit) (5) (3)  
Defined benefit plan asset 2 2  
Net defined benefit asset/ (liability)(Refer note 2.5) (7) (5)  
Pension | Defined Benefit Obligations      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 122 112  
Service cost 6 6  
Interest expense/income 2 2  
Remeasurements - Actuarial losses / (gains) 8 3  
Past service cost - plan amendments   (4)  
Employee contribution 4 4  
Ending balance 138 122 112
Benefits paid (7) (1)  
Translation differences 3    
Irrecoverable surplus - effect of asset ceiling 138 122 112
Pension | Plan Assets      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance (119) (106)  
Interest expense/income (2) (2)  
Employee contribution (4) (4)  
Ending balance (133) (119) (106)
Remeasurements - Returns on plan assets excluding amounts included in interest income 7 2  
Employer contribution 5 6  
Benefits paid 7 1  
Translation differences (3)    
Irrecoverable surplus - effect of asset ceiling (133) (119) (106)
Provident Fund      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Remeasurements - Actuarial losses / (gains) 26 12 (10)
Funded status surplus/(deficit) 7 (8)  
Net defined benefit asset/ (liability)(Refer note 2.5)   (8)  
Provident Fund | Defined Benefit Obligations      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 1,424 1,281  
Service cost 113 106  
Interest expense/income 102 92  
Remeasurements - Actuarial losses / (gains) (26) (12)  
Employee contribution 199 200  
Ending balance 1,622 1,424 1,281
Benefits paid (204) (246)  
Translation differences (38) (21)  
Irrecoverable surplus - effect of asset ceiling 1,622 1,424 1,281
Provident Fund | Plan Assets      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance (1,416) (1,239)  
Interest expense/income (101) (89)  
Employee contribution (199) (200)  
Ending balance (1,629) (1,416) (1,239)
Remeasurements - Returns on plan assets excluding amounts included in interest income 29 28  
Employer contribution 125 126  
Benefits paid 204 246  
Translation differences 37 20  
Irrecoverable surplus - effect of asset ceiling (1,629) $ (1,416) $ (1,239)
Provident Fund | Effect of Asset Ceiling      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Ending balance (7)    
Irrecoverable surplus - effect of asset ceiling $ (7)