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Derivative instruments - (Cross-currency Swaps) (Details) € in Millions, £ in Millions, SFr in Millions, $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 CHF (SFr) | Dec. 31, 2022 GBP (£)
--- | --- | --- | --- | ---
0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds) |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rate, stated percentage | 0.41% | 0.41% | 0.41% | 0.41%
Cash flow hedge [Member] | Cross-currency swap contracts | 0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds) |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 704 |  | SFr 700 |
Cash flow hedge [Member] | Cross-currency swap contracts | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 833 | € 750 |  |
Cash flow hedge [Member] | Cross-currency swap contracts | 5.50% 2026 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 747 |  |  | £ 475
Cash flow hedge [Member] | Cross-currency swap contracts | 4.00% 2029 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 1,111 |  |  | £ 700
Cash flow hedge [Member] | Cross-currency swap contracts | Euro Member Countries, Euro [Member] | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 2.00% | 2.00% | 2.00% | 2.00%
Cash flow hedge [Member] | Cross-currency swap contracts | Switzerland, Francs [Member] | 0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds) |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 0.40% | 0.40% | 0.40% | 0.40%
Cash flow hedge [Member] | Cross-currency swap contracts | United Kingdom, Pounds [Member] | 5.50% 2026 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 5.50% | 5.50% | 5.50% | 5.50%
Cash flow hedge [Member] | Cross-currency swap contracts | United Kingdom, Pounds [Member] | 4.00% 2029 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 4.00% | 4.00% | 4.00% | 4.00%
Cash flow hedge [Member] | Cross-currency swap contracts | United States of America, Dollars [Member] | 0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds) |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 3.40% | 3.40% | 3.40% | 3.40%
Cash flow hedge [Member] | Cross-currency swap contracts | United States of America, Dollars [Member] | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 3.90% | 3.90% | 3.90% | 3.90%
Cash flow hedge [Member] | Cross-currency swap contracts | United States of America, Dollars [Member] | 5.50% 2026 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 6.00% | 6.00% | 6.00% | 6.00%
Cash flow hedge [Member] | Cross-currency swap contracts | United States of America, Dollars [Member] | 4.00% 2029 pound sterling Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rates | 4.60% | 4.60% | 4.60% | 4.60%

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