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Consolidated shareholders’ equity - Summary of Movements within Other Comprehensive Income (Details) - EUR (€) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Items not subsequently reclassifiable to profit or loss | € (77,000,000) | € 451,000,000 | € 797,000,000
Items subsequently reclassifiable to profit or loss | (1,526,000,000) | 2,313,000,000 | 2,510,000,000
Accumulated other comprehensive income | Items not subsequently reclassifiable to profit or loss |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Actuarial gains/(losses) excluding investments accounted for using the equity method (see Note D.19.1.) | (171,000,000) | 650,000,000 | 685,000,000
Actuarial gains/(losses) of investments accounted for using the equity method, net of taxes | 0 | 4,000,000 | 1,000,000
Tax effects | 18,000,000 | (212,000,000) | (36,000,000)
Accumulated other comprehensive income | Items not subsequently reclassifiable to profit or loss | Equity instruments included in financial assets |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Change in fair value (excluding investments accounted for using the equity method) | 97,000,000 | (4,000,000) | 154,000,000
Change in fair value (investments accounted for using the equity method, net of taxes) | 0 | 0 | 0
Equity risk hedging instruments designated as fair value hedges | 0 | 17,000,000 | 11,000,000
Tax effects | (21,000,000) | (4,000,000) | (18,000,000)
Items not subsequently reclassifiable to profit or loss | (77,000,000) | 451,000,000 | 797,000,000
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Change in fair value (excluding investments accounted for using the equity method) | 1,000,000 | 5,000,000 | (6,000,000)
Change in fair value (investments accounted for using the equity method, net of taxes) | (2,000,000) | 2,000,000 | 0
Tax effects | 0 | (1,000,000) | 2,000,000
Currency translation differences on foreign subsidiaries (excluding investments accounted for using the equity method) | (1,551,000,000) | 2,643,000,000 | 2,719,000,000
Currency translation differences (investments accounted for using the equity method) | 3,000,000 | (11,000,000) | (6,000,000)
Hedges of net investments in foreign operations | 8,000,000 | (354,000,000) | (254,000,000)
Tax effects | (2,000,000) | 91,000,000 | 71,000,000
Items subsequently reclassifiable to profit or loss | (1,526,000,000) | 2,313,000,000 | 2,510,000,000
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Debt instruments |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Change in fair value (excluding investments accounted for using the equity method) | 21,000,000 | (77,000,000) | (21,000,000)
Tax effects | (4,000,000) | 15,000,000 | 5,000,000
Items subsequently reclassifiable to profit or loss | 0 | 0 | 4,000,000
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Cash Flow And Fair Value Hedge |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Items subsequently reclassifiable to profit or loss | 1,000,000 | 2,000,000 | 12,000,000
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Foreign Currency Translation |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Items subsequently reclassifiable to profit or loss | € (56,000,000) | (40,000,000) | € 0
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | EUROAPI | Foreign Currency Translation |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Items subsequently reclassifiable to profit or loss |  | € (35,000,000) |

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