v3.26.1
Leases - Schedule of Changes in Carrying Value of Right of Use Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Beginning balance $ 738 $ 786 $ 837
Additions 285 [1] 254 [1] 274 [2]
Addition due to Business Combination (Refer to Note 2.10)   20  
Deletions (132) (106) (114)
Impairment     (10)
Depreciation (213) (201) (193)
Translation difference (27) (15) (8)
Ending balance 651 738 786
Land      
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Beginning balance 70 72 76
Deletions (6)   (1)
Depreciation (1) (1) (1)
Translation difference (5) (1) (2)
Ending balance 58 70 72
Buildings      
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Beginning balance 392 396 474
Additions 66 [1] 96 [1] 47 [2]
Addition due to Business Combination (Refer to Note 2.10)   19  
Deletions (6) (28) (22)
Impairment     (10)
Depreciation (84) (84) (87)
Translation difference (26) (7) (6)
Ending balance 342 392 396
Vehicles      
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Beginning balance 3 2 2
Additions 1 [1] 3 [1] 1 [2]
Addition due to Business Combination (Refer to Note 2.10)   1  
Deletions   (1)  
Depreciation (1) (1) (1)
Translation difference 0 (1)  
Ending balance 3 3 2
Computer Equipment      
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Beginning balance 273 316 285
Additions 218 [1] 155 [1] 226 [2]
Deletions (120) (77) (91)
Depreciation (127) (115) (104)
Translation difference 4 (6)  
Ending balance $ 248 $ 273 $ 316
[1] Net of adjustments on account of modifications
[2] Net of adjustments on account of modifications and lease incentives