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Financial risk management - Narrative (Details) ₩ in Billions, ¥ in Billions, ¥ in Billions, $ in Billions, $ in Billions | 12 Months Ended |  |
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Dec. 31, 2025 EUR (€) eurobond | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2025 USD ($) | Dec. 31, 2025 JPY (¥) | Dec. 31, 2025 TWD ($) | Dec. 31, 2025 KRW (₩) | Dec. 31, 2025 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 JPY (¥) | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 KRW (₩) | Dec. 31, 2024 CNY (¥)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) from effective cash flow hedges | € (13,800,000) | € 8,900,000 | € (600,000) |  |  |  |  |  |  |  |  |  |
Gain (loss) on foreign currency fair value hedge derivatives | 65,100,000 | 31,400,000 | 52,400,000 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net | € 0 | 0 | € 0 |  |  |  |  |  |  |  |  |  |
Decrease of interest rates (in percentage) | 0.0100 |  |  | 0.0100 | 0.0100 | 0.0100 | 0.0100 | 0.0100 |  |  |  |  |
Supplier finance program, termination notice, period | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset, statement of financial position [extensible enumeration] | Other assets, Other non-current assets |  |  | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets |  |  |  |  |
Derivative asset, noncurrent, statement of financial position [extensible enumeration] | Other non-current assets |  |  | Other non-current assets | Other non-current assets | Other non-current assets | Other non-current assets | Other non-current assets |  |  |  |  |
Derivative asset, current, statement of financial position [extensible enumeration] | Other assets |  |  | Other assets | Other assets | Other assets | Other assets | Other assets |  |  |  |  |
Derivative liability, noncurrent, statement of financial position [extensible enumeration] | Accrued and other liabilities |  |  | Accrued and other liabilities | Accrued and other liabilities | Accrued and other liabilities | Accrued and other liabilities | Accrued and other liabilities |  |  |  |  |
Derivative liability, current, Statement of Financial Position [extensible enumeration] | Accrued and other liabilities |  |  | Accrued and other liabilities | Accrued and other liabilities | Accrued and other liabilities | Accrued and other liabilities | Accrued and other liabilities |  |  |  |  |
Number of eurobonds outstanding | eurobond | 5 |  |  |  |  |  |  |  |  |  |  |  |
Fair value assets (liabilities) transfers between levels amount | € 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of eurobonds outstanding | eurobond | 3 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € 2,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of eurobonds outstanding | eurobond | 2 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 2,250,000,000 | 3,250,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps | Fair value hedges |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset, statement of financial position [extensible enumeration] | Other assets, Other non-current assets |  |  | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets |  |  |  |  |
Derivative asset, noncurrent, statement of financial position [extensible enumeration] | Other non-current assets |  |  | Other non-current assets | Other non-current assets | Other non-current assets | Other non-current assets | Other non-current assets |  |  |  |  |
Derivative liability, statement of financial position [extensible enumeration] | Accrued and other liabilities, Accrued and other liabilities |  |  | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities |  |  |  |  |
Derivative liability, noncurrent, statement of financial position [extensible enumeration] | Accrued and other liabilities |  |  | Accrued and other liabilities | Accrued and other liabilities | Accrued and other liabilities | Accrued and other liabilities | Accrued and other liabilities |  |  |  |  |
Forward foreign exchange contracts |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € 755,800,000 | € 240,600,000 |  | $ 1.6 | ¥ 39.7 | $ 18.0 | ₩ 144.9 | ¥ 1.1 | $ 1.0 | ¥ 1.1 | $ 27.6 | ₩ 66.4 | ¥ 1.1
Forward foreign exchange contracts | Cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset, statement of financial position [extensible enumeration] | Other assets, Other non-current assets |  |  | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets |  |  |  |  |
Derivative liability, statement of financial position [extensible enumeration] | Accrued and other liabilities, Accrued and other liabilities |  |  | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities |  |  |  |  |
Forward foreign exchange contracts | Other hedges |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset, statement of financial position [extensible enumeration] | Other assets, Other non-current assets |  |  | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets | Other assets, Other non-current assets |  |  |  |  |
Derivative liability, statement of financial position [extensible enumeration] | Accrued and other liabilities, Accrued and other liabilities |  |  | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities | Accrued and other liabilities, Accrued and other liabilities |  |  |  |  |

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