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Derivative instruments - Notional Amounts & Interest Rates of Cross-currency Swaps (Details) € in Millions, £ in Millions, $ in Millions | Sep. 30, 2023 USD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2023 GBP (£)
--- | --- | --- | ---
2.00% 2026 euro Notes | Notes |  |  |
Derivative [Line Items] |  |  |
Interest rate, stated percentage | 2.00% | 2.00% | 2.00%
5.50% 2026 pound sterling Notes | Notes |  |  |
Derivative [Line Items] |  |  |
Interest rate, stated percentage | 5.50% | 5.50% | 5.50%
4.00% 2029 pound sterling Notes | Notes |  |  |
Derivative [Line Items] |  |  |
Interest rate, stated percentage | 4.00% | 4.00% | 4.00%
0.41% CHF700 million bonds due 2023 (0.41% 2023 Swiss franc Bonds) | Notes |  |  |
Derivative [Line Items] |  |  |
Interest rate, stated percentage | 0.41% | 0.41% | 0.41%
Cash flow hedge | Cross-currency swap contracts | 2.00% 2026 euro Notes |  |  |
Derivative [Line Items] |  |  |
Notional amounts | $ 833 | € 750 |
Cash flow hedge | Cross-currency swap contracts | 5.50% 2026 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Notional amounts | 747 |  | £ 475
Cash flow hedge | Cross-currency swap contracts | 4.00% 2029 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Notional amounts | 1,111 |  | £ 700
Cash flow hedge | Cross-currency swap contracts | 0.41% CHF700 million bonds due 2023 (0.41% 2023 Swiss franc Bonds) |  |  |
Derivative [Line Items] |  |  |
Notional amounts | $ 704 |  |
Cash flow hedge | Cross-currency swap contracts | Euro Member Countries, Euro | 2.00% 2026 euro Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 2.00% | 2.00% | 2.00%
Cash flow hedge | Cross-currency swap contracts | United Kingdom, Pounds | 5.50% 2026 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 5.50% | 5.50% | 5.50%
Cash flow hedge | Cross-currency swap contracts | United Kingdom, Pounds | 4.00% 2029 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 4.00% | 4.00% | 4.00%
Cash flow hedge | Cross-currency swap contracts | United States of America, Dollars | 2.00% 2026 euro Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 3.90% | 3.90% | 3.90%
Cash flow hedge | Cross-currency swap contracts | United States of America, Dollars | 5.50% 2026 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 6.00% | 6.00% | 6.00%
Cash flow hedge | Cross-currency swap contracts | 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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