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Derivative financial instruments- Disclosure of Financial Currency Hedging Instruments in Place with Notional Amount Translated (Details) € in Millions, R$ in Millions, $ in Millions | 6 Months Ended |
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Jun. 30, 2026 EUR (€) swaps | Jun. 30, 2025 EUR (€) | Jun. 30, 2026 USD ($) | Jun. 30, 2026 BRL (R$)
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Number of cross currency swaps | swaps | 2 |  |  |
Change in fair value of cash flow hedges | € 14 | € (23) |  |
Finance income (cost) | (328) | € (177) |  |
Cross currency swap, expiring 2029 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Notional amount | $ |  |  | $ 870 |
Cross currency swap, expiring 2032 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Notional amount | $ |  |  | 870 |
Cross currency swap |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Derivative financial liabilities | 37 |  |  |
Change in fair value of cash flow hedges | (33) |  |  |
Finance income (cost) | (4) |  |  |
Forward currency sales In US dollar, expiring in 2026 and 2027 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Notional amount | $ |  |  | 12,275 |
Derivative financial liabilities | 223 |  |  |
Change in fair value of cash flow hedges | (222) |  |  |
Finance income (cost) | (1) |  |  |
Forward currency sales in BRL, expiring in 2027 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Notional amount | R$ |  |  |  | R$ 1,200
Derivative financial liabilities | 9 |  |  |
Change in fair value of cash flow hedges | (10) |  |  |
Finance income (cost) | 1 |  |  |
Forward currency purchases in US dollar, US bond |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Notional amount | $ |  |  | 1,000 |
Derivative financial liabilities | 6 |  |  |
Finance income (cost) | (6) |  |  |
Notional amount |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 29,412 |  |  |
Notional amount | Cross currency seller swaps |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 1,523 |  |  |
Notional amount | of which US dollar | 2027 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 1,523 |  |  |
Notional amount | Forward currency sales |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 16,423 |  |  |
Notional amount | of which US dollar | 2027 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 13,361 |  |  |
Notional amount | of which Pound sterling | 2026 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 1,401 |  |  |
Notional amount | of which Brazilian real | 2026 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 204 |  |  |
Notional amount | Forward currency purchases |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 11,466 |  |  |
Notional amount | of which US dollar | 2027 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 8,657 |  |  |
Notional amount | of which Singapore dollar | 2026 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 1,299 |  |  |
Notional amount | of which Hungarian forint | 2026 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 543 |  |  |
Fair value |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | (139) |  |  |
Fair value | Cross currency seller swaps |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | (37) |  |  |
Fair value | of which US dollar | 2027 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | (37) |  |  |
Fair value | Forward currency sales |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | (272) |  |  |
Fair value | of which US dollar | 2027 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | (241) |  |  |
Fair value | of which Pound sterling | 2026 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | (7) |  |  |
Fair value | of which Brazilian real | 2026 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | (9) |  |  |
Fair value | Forward currency purchases |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 170 |  |  |
Fair value | of which US dollar | 2027 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 143 |  |  |
Fair value | of which Singapore dollar | 2026 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | 6 |  |  |
Fair value | of which Hungarian forint | 2026 |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Financial currency hedging instruments in place | € 19 |  |  |
Fair value | Forward currency purchases in US dollar, US bond |  |  |  |
Disclosure of Information about Terms and Conditions of Hedging Instruments and How They Affect Future Cash Flows [Line Items] |  |  |  |
Notional amount | $ |  |  | $ 1,000 |

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