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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | € 17,710 | € 20,408 | € 21,728
Principal | 16,468 | 18,932 | 20,086
Interest | 1,242 | 1,476 | 1,642
Net cash flows related to derivative instruments | 143 | 209 | (51)
Total | 17,853 | 20,617 | 21,677
Year 1 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 2,153 | 4,206 | 3,330
Principal | 1,917 | 3,928 | 3,055
Interest | 236 | 278 | 275
Net cash flows related to derivative instruments | 47 | 24 | (59)
Total | 2,200 | 4,230 | 3,271
Year 2 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 2,912 | 868 | 3,826
Principal | 2,703 | 661 | 3,588
Interest | 209 | 207 | 238
Net cash flows related to derivative instruments | 32 | 60 | (1)
Total | 2,944 | 928 | 3,825
Year 3 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 3,187 | 2,803 | 791
Principal | 3,011 | 2,601 | 601
Interest | 176 | 202 | 190
Net cash flows related to derivative instruments | 23 | 38 | 2
Total | 3,210 | 2,841 | 793
Year 4 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 1,285 | 3,184 | 1,937
Principal | 1,151 | 3,011 | 1,751
Interest | 134 | 173 | 186
Net cash flows related to derivative instruments | 24 | 31 | 2
Total | 1,309 | 3,215 | 1,939
Year 5 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 1,719 | 1,283 | 3,176
Principal | 1,607 | 1,151 | 3,011
Interest | 112 | 132 | 165
Net cash flows related to derivative instruments | 16 | 31 | 2
Total | 1,735 | 1,314 | 3,178
Year 5 and later |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 6,454 | 8,064 | 8,668
Principal | 6,079 | 7,580 | 8,080
Interest | 375 | 484 | 588
Net cash flows related to derivative instruments | 1 | 25 | 3
Total | € 6,455 | € 8,089 | € 8,671

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