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Derivative instruments (Cross-currency Swaps) (Details) - Cash flow hedge - Cross-currency swap contracts € in Millions, £ in Millions, $ in Millions	Mar. 31, 2023 USD ($)	Mar. 31, 2023 EUR (€)	Mar. 31, 2023 GBP (£)
0.41% 2023 Swiss franc Bonds
Derivative [Line Items]
Notional amounts	$ 704
2.00% 2026 euro Notes
Derivative [Line Items]
Notional amounts	833	€ 750
5.50% 2026 pound sterling Notes
Derivative [Line Items]
Notional amounts	747		£ 475
4.00% 2029 pound sterling Notes
Derivative [Line Items]
Notional amounts	$ 1,111		£ 700
Euro Member Countries, Euro | 2.00% 2026 euro Notes
Derivative [Line Items]
Interest rates	2.00%	2.00%	2.00%
United Kingdom, Pounds | 5.50% 2026 pound sterling Notes
Derivative [Line Items]
Interest rates	5.50%	5.50%	5.50%
United Kingdom, Pounds | 4.00% 2029 pound sterling Notes
Derivative [Line Items]
Interest rates	4.00%	4.00%	4.00%
United States of America, Dollars | 2.00% 2026 euro Notes
Derivative [Line Items]
Interest rates	3.90%	3.90%	3.90%
United States of America, Dollars | 5.50% 2026 pound sterling Notes
Derivative [Line Items]
Interest rates	6.00%	6.00%	6.00%
United States of America, Dollars | 4.00% 2029 pound sterling Notes
Derivative [Line Items]
Interest rates	4.60%	4.60%	4.60%

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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