Income Taxes - Schedule of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Income Taxes [Line Items]
Current taxes	$ 1,329	$ 1,435	$ 1,015
Deferred taxes	(139)	(150)	162
Income tax expense	1,190	1,285	1,177
Domestic Countries
Income Taxes [Line Items]
Current taxes	977	1,089	768
Deferred taxes	(91)	(110)	180
Foreign Countries
Income Taxes [Line Items]
Current taxes	352	346	247
Deferred taxes	$ (48)	$ (40)	$ (18)

- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2025-01-01
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
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-Subparagraph b
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-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2025-01-01
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2025-01-01
-Paragraph 81
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_c_ii&doctype=Standard
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Name IFRS
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
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-Number 1
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-URIDate 2025-03-27

+ Details