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Derivative instruments (Cross-currency Swaps) (Details) - Cash flow hedge [Member] - Cross-currency swap contracts [Member] € in Millions, £ in Millions, SFr in Millions, $ in Millions | Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 CHF (SFr) | Sep. 30, 2021 GBP (£)
--- | --- | --- | --- | ---
1.25% 2022 euro Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amounts | $ 1,388 | € 1,250 |  |
0.41% 2023 Swiss franc Bonds [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amounts | 704 |  | SFr 700 |
2.00% 2026 euro Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amounts | 833 | € 750 |  |
5.50% 2026 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amounts | 747 |  |  | £ 475
4.00% 2029 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amounts | $ 1,111 |  |  | £ 700
Euro Member Countries, Euro | 1.25% 2022 euro Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 1.30% | 1.30% | 1.30% | 1.30%
Euro Member Countries, Euro | 2.00% 2026 euro Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 2.00% | 2.00% | 2.00% | 2.00%
Switzerland, Francs | 0.41% 2023 Swiss franc Bonds [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 0.40% | 0.40% | 0.40% | 0.40%
United Kingdom, Pounds | 5.50% 2026 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 5.50% | 5.50% | 5.50% | 5.50%
United Kingdom, Pounds | 4.00% 2029 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 4.00% | 4.00% | 4.00% | 4.00%
United States of America, Dollars | 1.25% 2022 euro Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 3.20% | 3.20% | 3.20% | 3.20%
United States of America, Dollars | 0.41% 2023 Swiss franc Bonds [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 3.40% | 3.40% | 3.40% | 3.40%
United States of America, Dollars | 2.00% 2026 euro Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 3.90% | 3.90% | 3.90% | 3.90%
United States of America, Dollars | 5.50% 2026 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 6.00% | 6.00% | 6.00% | 6.00%
United States of America, Dollars | 4.00% 2029 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 4.50% | 4.50% | 4.50% | 4.50%

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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 http://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 http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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