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Financial instruments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Commodity price sensitivity [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Percentage of reasonably possible change, market risk | 30.00% |
Level 3 [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Total gains and losses recognised in statement of income, assets | $ 108 | $ 109
Gains on change in fair value of derivatives | 86 |
The amount of increase (decrease) in the fair value of asset | 187 |
Level 3 [member] | Market Risk [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Total gains and losses recognised in statement of income, assets | 20 |
Level 3 [member] | Certain earn-out agreements [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
Total gains and losses recognised in statement of income, assets | 108 |
Extrapolation approach [member] | Level 3 [member] | Certain earn-out agreements [member] |  |
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items] |  |
The amount of increase (decrease) in the fair value of asset | $ 400 | $ 100

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