v3.26.1
Segment Reporting - Schedule of Segmented Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of Operating Segments [Line Items]      
Revenues $ 20,158 $ 19,277 $ 18,562
Identifiable operating expenses 11,670 11,237 10,856
Allocated expenses 3,708 3,400 3,307
Segment profit 4,780 4,640 4,399
Unallocable expenses 695 569 565
Operating profit 4,085 4,071 3,834
Other income, net 468 425 568
Finance cost 47 49 56
Profit before income taxes 4,506 4,447 4,346
Income tax expense 1,190 1,285 1,177
Net profit 3,316 3,162 3,169
Depreciation and amortization 552 569 565
Operating Segments | Financial Services      
Disclosure of Operating Segments [Line Items]      
Revenues 5,631 5,342 5,093
Identifiable operating expenses 3,149 3,059 2,993
Allocated expenses 1,055 971 973
Segment profit 1,427 1,312 1,127
Operating Segments | Manufacturing      
Disclosure of Operating Segments [Line Items]      
Revenues 3,282 2,980 2,696
Identifiable operating expenses 2,010 1,911 1,763
Allocated expenses 546 495 423
Segment profit 726 574 510
Operating Segments | Energy, Utilities, Resources and Services      
Disclosure of Operating Segments [Line Items]      
Revenues 2,688 2,568 2,417
Identifiable operating expenses 1,505 1,406 1,309
Allocated expenses 508 441 444
Segment profit 675 721 664
Operating Segments | Retail      
Disclosure of Operating Segments [Line Items]      
Revenues 2,605 2,609 2,719
Identifiable operating expenses 1,302 1,293 1,414
Allocated expenses 504 472 473
Segment profit 799 844 832
Operating Segments | Communication      
Disclosure of Operating Segments [Line Items]      
Revenues 2,455 2,260 2,173
Identifiable operating expenses 1,570 1,469 1,337
Allocated expenses 451 396 391
Segment profit 434 395 445
Operating Segments | Hi-Tech      
Disclosure of Operating Segments [Line Items]      
Revenues 1,572 1,548 1,498
Identifiable operating expenses 936 897 874
Allocated expenses 273 270 245
Segment profit 363 381 379
Operating Segments | Life Sciences      
Disclosure of Operating Segments [Line Items]      
Revenues 1,383 1,400 1,391
Identifiable operating expenses 864 848 811
Allocated expenses 243 237 230
Segment profit 276 315 350
Operating Segments | All Other Segments      
Disclosure of Operating Segments [Line Items]      
Revenues 542 570 575
Identifiable operating expenses 334 354 355
Allocated expenses 128 118 128
Segment profit $ 80 $ 98 $ 92