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Share-based compensation - Narrative (Details) € / shares in Units, $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2023 EUR (€) € / shares shares | Dec. 31, 2023 GBP (£) shares | Dec. 31, 2022 € / shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 € / shares | Dec. 31, 2021 USD ($) $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of shares reserved for sale | 10.00% | 10.00% | 10.00% |  | 10.00% |  | 10.00%
Performance shares |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 3 years | 3 years | 3 years |  |  |  |
Weighted average grant date fair value (in usd per share) | (per share) | $ 48.55 | € 45.57 |  | € 34.50 | $ 36.29 | € 35.40 | $ 42.05
Awards vested (in shares) | shares | 2,985,299 | 2,985,299 | 2,985,299 |  | 3,084,926 |  | 2,915,761
Fair value of awards vested | $ 147 |  |  |  | $ 123 |  | $ 137
Unrecognized compensation expense | $ 179 |  |  |  |  |  |
Unrecognized compensation expense, remaining weighted average vesting period | 1 year 3 months 21 days | 1 year 3 months 21 days | 1 year 3 months 21 days |  |  |  |
Performance shares | Total shareholder return metric |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance conditions, percentage | 20.00% | 20.00% | 20.00% |  | 20.00% |  | 25.00%
Performance shares | Return on net assets metric |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance conditions, percentage | 20.00% | 20.00% | 20.00% |  | 20.00% |  | 25.00%
Performance shares | Sustainability and diversity metric |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance conditions, percentage | 15.00% | 15.00% | 15.00% |  | 15.00% |  |
Performance shares | Cumulative cash flow metric |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance conditions, percentage | 45.00% | 45.00% | 45.00% |  | 45.00% |  | 50.00%
Share option |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense | $ 4 |  |  |  |  |  |
Unrecognized compensation expense, remaining weighted average vesting period | 1 year 7 months 28 days | 1 year 7 months 28 days | 1 year 7 months 28 days |  |  |  |
Amount participants may save per month |  | € 500 | £ 500 |  |  |  |
Participant purchase period | 6 months | 6 months | 6 months |  |  |  |
Discount percentage | 15.00% | 15.00% | 15.00% |  |  |  |
Stock purchased (in shares) | shares | 86,520 | 86,520 | 86,520 |  | 402,645 |  | 470,001
Purchase price (in usd per share) | $ / shares | $ 26.82 |  |  |  | $ 25.24 |  | $ 25.88
Share option | Minimum |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Participant saving period | 3 years | 3 years | 3 years |  |  |  |
Share option | Maximum |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Participant saving period | 5 years | 5 years | 5 years |  |  |  |
Share options, 3-year |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Volatility assumption, months in historical sample | 37 months | 37 months | 37 months |  |  |  |
Share options, 5-year |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |
Volatility assumption, months in historical sample | 61 months | 61 months | 61 months |  |  |  |

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