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Debt, cash and cash equivalents and lease liabilities - Amount of Future Undiscounted Contractual Cash Flows Relating to Debt and Derivative Instruments Designated as Hedges of Debt (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |  |  |
Debt | € 17,077 |  | € 17,710 |  | € 20,408 |
Principal | 16,049 |  | 16,468 |  | 18,932 |
Interest | 1,028 | [1] | 1,242 | [2] | 1,476 | [3]
Net cash flows related to derivative instruments | 161 |  | 143 |  | 209 |
Total | 17,238 |  | 17,853 |  | 20,617 |
Year 1 |  |  |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |  |  |
Debt | 4,328 |  | 2,153 |  | 4,206 |
Principal | 4,105 |  | 1,917 |  | 3,928 |
Interest | 223 | [1] | 236 | [2] | 278 | [3]
Net cash flows related to derivative instruments | 71 |  | 47 |  | 24 |
Total | 4,399 |  | 2,200 |  | 4,230 |
Year 2 |  |  |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |  |  |
Debt | 3,226 |  | 2,912 |  | 868 |
Principal | 3,047 |  | 2,703 |  | 661 |
Interest | 179 | [1] | 209 | [2] | 207 | [3]
Net cash flows related to derivative instruments | 34 |  | 32 |  | 60 |
Total | 3,260 |  | 2,944 |  | 928 |
Year 3 |  |  |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |  |  |
Debt | 1,288 |  | 3,187 |  | 2,803 |
Principal | 1,151 |  | 3,011 |  | 2,601 |
Interest | 137 | [1] | 176 | [2] | 202 | [3]
Net cash flows related to derivative instruments | 34 |  | 23 |  | 38 |
Total | 1,322 |  | 3,210 |  | 2,841 |
Year 4 |  |  |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |  |  |
Debt | 1,780 |  | 1,285 |  | 3,184 |
Principal | 1,667 |  | 1,151 |  | 3,011 |
Interest | 113 | [1] | 134 | [2] | 173 | [3]
Net cash flows related to derivative instruments | 21 |  | 24 |  | 31 |
Total | 1,801 |  | 1,309 |  | 3,215 |
Year 5 |  |  |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |  |  |
Debt | 1,388 |  | 1,719 |  | 1,283 |
Principal | 1,300 |  | 1,607 |  | 1,151 |
Interest | 88 | [1] | 112 | [2] | 132 | [3]
Net cash flows related to derivative instruments | 1 |  | 16 |  | 31 |
Total | 1,389 |  | 1,735 |  | 1,314 |
Year 5 and later |  |  |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |  |  |
Debt | 5,067 |  | 6,454 |  | 8,064 |
Principal | 4,779 |  | 6,079 |  | 7,580 |
Interest | 288 | [1] | 375 | [2] | 484 | [3]
Net cash flows related to derivative instruments | 0 |  | 1 |  | 25 |
Total | € 5,067 |  | € 6,455 |  | € 8,089 |
[1] | (a)Interest flows are estimated on the basis of forward interest rates applicable as of December 31, 2024
[2] | (a)Interest flows are estimated on the basis of forward interest rates applicable as of December 31, 2023
[3] | (a)Interest flows are estimated on the basis of forward interest rates applicable as of December 31, 2022

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