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Debt, cash and cash equivalents and lease liabilities - Summary of Reconciliation of Carrying Amount to Value on Redemption (Details) - EUR (€) € in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of reconciliation of carrying amount to value on redemption [line items] |  |  |  |  |  |
Long-term debt | € 14,857 | € 17,123 | € 19,745 | [1] |  |
Short-term debt and current portion of long-term debt | 4,174 | 3,183 | 2,767 | [1] |  |
Interest rate and currency derivatives used to manage debt | 187 | (56) | 119 |  |  |
Total debt | 19,218 | 20,250 | 22,631 |  | € 24,568 |
Cash and cash equivalents | (12,736) | (10,098) | (13,915) | [2],[3] | € (9,427) | [2]
Interest rate and currency derivatives used to manage cash and cash equivalents | (45) | (169) | 74 |  |  |
Net debt | 6,437 | 9,983 | 8,790 |  |  |
Amortized cost |  |  |  |  |  |
Disclosure of reconciliation of carrying amount to value on redemption [line items] |  |  |  |  |  |
Long-term debt | 51 |  |  |  |  |
Short-term debt and current portion of long-term debt | 0 |  |  |  |  |
Interest rate and currency derivatives used to manage debt | 0 |  |  |  |  |
Total debt | 51 |  |  |  |  |
Cash and cash equivalents | 0 |  |  |  |  |
Interest rate and currency derivatives used to manage cash and cash equivalents | 0 |  |  |  |  |
Net debt | 51 |  |  |  |  |
Adjustment to debt measured at fair value |  |  |  |  |  |
Disclosure of reconciliation of carrying amount to value on redemption [line items] |  |  |  |  |  |
Long-term debt | 235 |  |  |  |  |
Short-term debt and current portion of long-term debt | 4 |  |  |  |  |
Interest rate and currency derivatives used to manage debt | (235) |  |  |  |  |
Total debt | 4 |  |  |  |  |
Cash and cash equivalents | 0 |  |  |  |  |
Interest rate and currency derivatives used to manage cash and cash equivalents | 0 |  |  |  |  |
Net debt | 4 |  |  |  |  |
Value on redemption |  |  |  |  |  |
Disclosure of reconciliation of carrying amount to value on redemption [line items] |  |  |  |  |  |
Long-term debt | 15,143 | 17,176 | 19,794 |  |  |
Short-term debt and current portion of long-term debt | 4,178 | 3,183 | 2,767 |  |  |
Interest rate and currency derivatives used to manage debt | (48) | (45) | 142 |  |  |
Total debt | 19,273 | 20,314 | 22,703 |  |  |
Cash and cash equivalents | (12,736) | (10,098) | (13,915) |  |  |
Interest rate and currency derivatives used to manage cash and cash equivalents | (45) | (169) | 74 |  |  |
Net debt | € 6,492 | € 10,047 | € 8,862 |  |  |
[1] | Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.
[2] | (j) Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.
[3] | Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.

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