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Summary of significant accounting policies - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 USD ($) segment | Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Variable Interest Entity [Line Items] |  |  |  |
Number of reportable segments | segment | 3 | 3 |  |
China investment |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Difference between carrying amount and underlying equity | $ 190 | $ 190 |  |
Other-than-temporary impairment |  | 190 | $ 0 | $ 0
Designated as hedging instrument | Fair value hedging |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative, notional amount | 1,375 | 1,375 | 1,375 |
Designated as hedging instrument | Cash flow hedging |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative, notional amount | 342 | 342 | 550 |
Designated as hedging instrument | Net investment hedging |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative, notional amount | 1,371 | 1,371 | 1,187 |
Not designated as hedging instrument |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative, notional amount | $ 3,323 | $ 3,323 | $ 338 |
Minimum | Customer-related |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 5 years | 5 years |  |
Minimum | Marketing-related |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 10 years | 10 years |  |
Maximum | Customer-related |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 20 years | 20 years |  |
Maximum | Marketing-related |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 30 years | 30 years |  |
Building |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Property, plant and equipment, useful life | 40 years | 40 years |  |
Plant and machinery | Minimum |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Property, plant and equipment, useful life | 5 years | 5 years |  |
Plant and machinery | Maximum |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Property, plant and equipment, useful life | 30 years | 30 years |  |

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