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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | € 20,408 | € 21,728 | € 24,339
Principal | 18,932 | 20,086 | 22,392
Interest | 1,476 | 1,642 | 1,947
Net cash flows related to derivative instruments | 209 | (51) | 163
Total | 20,617 | 21,677 | 24,502
Year 1 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 4,206 | 3,330 | 2,943
Principal | 3,928 | 3,055 | 2,622
Interest | 278 | 275 | 321
Net cash flows related to derivative instruments | 24 | (59) | 135
Total | 4,230 | 3,271 | 3,078
Year 2 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 868 | 3,826 | 3,019
Principal | 661 | 3,588 | 2,757
Interest | 207 | 238 | 262
Net cash flows related to derivative instruments | 60 | (1) | 28
Total | 928 | 3,825 | 3,047
Year 3 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 2,803 | 791 | 3,808
Principal | 2,601 | 601 | 3,571
Interest | 202 | 190 | 237
Net cash flows related to derivative instruments | 38 | 2 | 0
Total | 2,841 | 793 | 3,808
Year 4 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 3,184 | 1,937 | 791
Principal | 3,011 | 1,751 | 601
Interest | 173 | 186 | 190
Net cash flows related to derivative instruments | 31 | 2 | 0
Total | 3,215 | 1,939 | 791
Year 5 |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 1,283 | 3,176 | 1,937
Principal | 1,151 | 3,011 | 1,751
Interest | 132 | 165 | 186
Net cash flows related to derivative instruments | 31 | 2 | 0
Total | 1,314 | 3,178 | 1,937
Year 5 and later |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |
Debt | 8,064 | 8,668 | 11,841
Principal | 7,580 | 8,080 | 11,090
Interest | 484 | 588 | 751
Net cash flows related to derivative instruments | 25 | 3 | 0
Total | € 8,089 | € 8,671 | € 11,841

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