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Performance B.4.1. Share-based compensation - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) | Dec. 31, 2019 | Dec. 31, 2020 plan
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of plans | plan |  |  |  | 2
Deferred share plans |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period |  |  | 3 years |
Deferred share plans | Tranche One |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting percentage |  |  | 30.00% |
Deferred share plans | Tranche Three |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting percentage |  |  | 40.00% |
2018 Performance Plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period | 3 years |  |  |
2018 Performance Plan | Tranche One |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting percentage | 25.00% |  |  |
2018 Performance Plan | Tranche Two |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting percentage | 25.00% |  |  |
2018 Performance Plan | Tranche Three |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting percentage | 50.00% |  |  |
Performance share plan 2021 (Relative TSR) | Restricted Stock Units |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Vesting period | 3 years |  |  |
Shares granted as percent of total award | 35.00% |  |  |
Performance share plan 2021 (Relative TSR) | Relative TSR |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Shares granted as percent of total award | 20.00% |  |  |
Number of trading days | 10 days |  |  |
Measurement period | 3 years |  |  |
Service revenue performance conditions percent | 30.00% | 15.00% |  |
Operating cash flow after leases performance conditions percent | 50.00% | 30.00% |  |
Cumulative achievement for cumulative targets, period | 3 years |  |  |
Performance share plan 2021 (Relative TSR) | Market Stock Units (MSU) | Executive Officer |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Target share price (in dollars per share) | $ 30.75 |  |  |
Payment threshold of target award value | 150.00% |  |  |
Financial liabilities, at fair value | $ | $ 2 | $ 3 |  |
Gains (losses) on financial liabilities at fair value through profit or loss | $ | $ 1 | $ (3) |  |
Performance share plan 2021 (Relative TSR) | Tranche 2022 | Market Stock Units (MSU) | Executive Officer |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Share price at inception (in dollars per share) | $ 33.83 |  |  |
Share price appreciation percent | 10.00% |  |  |
Value determination, trading day average share price period | 30 days |  |  |
Performance share plan 2021 (Relative TSR) | Tranche 2023 | Market Stock Units (MSU) | Executive Officer |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Share price at inception (in dollars per share) | $ 36.90 |  |  |
Share price appreciation percent | 20.00% |  |  |
Value determination, trading day average share price period | 30 days |  |  |

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