v3.26.1
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, 2026
Mar. 31, 2025
Mar. 31, 2024
Gratuity      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Remeasurements - Actuarial losses / (gains) $ (3) $ 12 $ 4
Funded status surplus/(deficit) 11 25  
Defined benefit plan asset 20 33  
Net defined benefit asset/ (liability)(Refer note 2.5) (9) (8)  
Gratuity | Defined Benefit Obligations      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 294 253  
Transfer   1  
Service cost 49 40  
Interest expense/income 20 17  
Remeasurements - Actuarial losses / (gains) (3) 12  
Past service cost - plan amendments 136    
Benefits paid (24) (22)  
Translation differences (39) (7)  
Ending balance 433 294 253
Pension      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Remeasurements - Actuarial losses / (gains) 9 8 3
Funded status surplus/(deficit) (7) (5)  
Defined benefit plan asset 1 2  
Net defined benefit asset/ (liability)(Refer note 2.5) (8) (7)  
Pension | Defined Benefit Obligations      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 138 122  
Service cost 6 6  
Interest expense/income 2 2  
Remeasurements - Actuarial losses / (gains) 9 8  
Employee contribution 5 4  
Benefits paid 10 (7)  
Translation differences 14 3  
Ending balance 184 138 122
Provident Fund      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Remeasurements - Actuarial losses / (gains) 11 26 12
Funded status surplus/(deficit) (38) 7  
Net defined benefit asset/ (liability)(Refer note 2.5) (38)    
Provident Fund | Defined Benefit Obligations      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Beginning balance 1,622 1,424  
Service cost 123 113  
Interest expense/income 106 102  
Remeasurements - Actuarial losses / (gains) 11 26  
Employee contribution 230 199  
Benefits paid (218) (204)  
Translation differences (177) (38)  
Ending balance $ 1,697 1,622 $ 1,424
Provident Fund | Effect of Asset Ceiling      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Irrecoverable surplus - effect of asset ceiling   $ (7)