v3.26.1
Income Taxes - Summary of Movement in Gross Deferred Income Tax Assets / Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Income Taxes [Line Items]      
Carrying value, beginning balance $ (72) $ (161) $ 3
Changes through profit and loss 139 150 (162)
Addition through business combination (4) (62)  
Changes through OCI 4 (2) (2)
Translation difference (5) 3  
Carrying value, ending balance 62 (72) (161)
Property, plant and equipment      
Income Taxes [Line Items]      
Carrying value, beginning balance 28 29 21
Changes through profit and loss (10) (1) 9
Translation difference (4)   (1)
Carrying value, ending balance 14 28 29
Lease liabilities      
Income Taxes [Line Items]      
Carrying value, beginning balance 18 24 27
Changes through profit and loss 10 (5) (3)
Translation difference (2) (1)  
Carrying value, ending balance 26 18 24
Accrued compensation to employees      
Income Taxes [Line Items]      
Carrying value, beginning balance 9 7 8
Changes through profit and loss 5 2 (1)
Carrying value, ending balance 14 9 7
Trade Receivables      
Income Taxes [Line Items]      
Carrying value, beginning balance 26 27 32
Changes through profit and loss (3) (1) (5)
Translation difference (2)    
Carrying value, ending balance 21 26 27
Compensated absences      
Income Taxes [Line Items]      
Carrying value, beginning balance 83 75 70
Changes through profit and loss 14 9 6
Translation difference (8) (1) (1)
Carrying value, ending balance 89 83 75
Post sales client support      
Income Taxes [Line Items]      
Carrying value, beginning balance 8 7 30
Changes through profit and loss (3) 1 (23)
Carrying value, ending balance 5 8 7
Credits related to branch profits      
Income Taxes [Line Items]      
Carrying value, beginning balance 93 97 87
Changes through profit and loss (7) (4) 10
Translation difference (4)    
Carrying value, ending balance 82 93 97
Derivative Financial Instruments      
Income Taxes [Line Items]      
Carrying value, beginning balance (4) (2)  
Changes through profit and loss 17 (3) (1)
Changes through OCI   1 (1)
Translation difference 1    
Carrying value, ending balance 14 (4) (2)
Intangibles      
Income Taxes [Line Items]      
Carrying value, beginning balance 8 7 7
Changes through profit and loss 1 1  
Carrying value, ending balance 9 8 7
Intangibles arising on business combinations      
Income Taxes [Line Items]      
Carrying value, beginning balance (80) (34) (42)
Changes through profit and loss 20 17 8
Addition through business combination (5) (63)  
Translation difference (5)    
Carrying value, ending balance (70) (80) (34)
Branch profit tax      
Income Taxes [Line Items]      
Carrying value, beginning balance (124) (129) (105)
Changes through profit and loss 16 5 (24)
Translation difference 4    
Carrying value, ending balance (104) (124) (129)
SEZ reinvestment reserve      
Income Taxes [Line Items]      
Carrying value, beginning balance (168) (239) (164)
Changes through profit and loss 61 67 (78)
Translation difference 13 4 3
Carrying value, ending balance (94) (168) (239)
Interest Receivable on Income Tax Refund      
Income Taxes [Line Items]      
Carrying value, beginning balance (8) (58)  
Changes through profit and loss 7 49 (58)
Translation difference   1  
Carrying value, ending balance (1) (8) (58)
Others      
Income Taxes [Line Items]      
Carrying value, beginning balance 39 28 32
Changes through profit and loss 11 13 (2)
Addition through business combination 1 1  
Changes through OCI 4 (3) (1)
Translation difference 2   (1)
Carrying value, ending balance $ 57 $ 39 $ 28