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Derivative instruments - (Cross-currency Swaps) (Details) € in Millions, £ in Millions, SFr in Millions, $ in Millions | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CHF (SFr) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
2.125% 2019 Euro Notes | Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  | 2.125% | 2.125%
1.25% 2022 euro Notes [Member] | Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 1.25% | 1.25% | 1.25% | 1.25% | 1.25% |
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% |  |
0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds) | Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 0.41% | 0.41% | 0.41% | 0.41% |  |
2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) | Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.00% | 2.00% | 2.00% | 2.00% |  |
5.50% 2026 pound sterling Notes [Member] | Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 5.50% | 5.50% | 5.50% | 5.50% |  |
4.00% 2029 pound sterling Notes [Member] | Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 4.00% | 4.00% | 4.00% | 4.00% |  |
Cash flow hedge [Member] | Cross-currency swap contracts [Member] | 1.25% 2022 euro Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | € 1,250 |  |  |  |  |
Interest rate, stated percentage | 1.25% | 1.25% | 1.25% | 1.25% |  |
Cash flow hedge [Member] | Cross-currency swap contracts [Member] | 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 [Member] | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | € 750 | 833 |  |  |  |
Cash flow hedge [Member] | Cross-currency swap contracts [Member] | 5.50% 2026 pound sterling Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | 747 |  | £ 475 |  |
Cash flow hedge [Member] | Cross-currency swap contracts [Member] | 4.00% 2029 pound sterling Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | $ 1,111 |  | £ 700 |  |
Cash flow hedge [Member] | Cross-currency swap contracts [Member] | 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 [Member] | 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 [Member] | 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 [Member] | 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 [Member] | 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 [Member] | 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 [Member] | 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 [Member] | United States of America, Dollars [Member] | 4.00% 2029 pound sterling Notes [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rates | 4.50% | 4.50% | 4.50% | 4.50% |  |

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