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Cash Flow Detail - Operating Activities (Details) € in Millions, £ in Millions |  |  |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2022 EUR (€) | Dec. 31, 2022 GBP (£) | Sep. 30, 2022 EUR (€) | Sep. 30, 2022 GBP (£) | Jun. 30, 2022 EUR (€) | Jun. 30, 2022 GBP (£) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 GBP (£) | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 GBP (£) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 EUR (€)
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from operations |  |  |  |  |  |  |  |  | € 46,925 |  | € 46,415 |  | € 51,353
Cash paid from operations |  |  |  |  |  |  |  |  | (34,778) |  | (34,379) |  | (36,477)
Cash paid to suppliers |  |  |  |  |  |  |  |  | (29,509) |  | (29,236) |  | (31,080)
Cash paid to employees |  |  |  |  |  |  |  |  | (4,416) |  | (4,299) |  | (4,434)
Payments related to cancellation of commitments |  |  |  |  |  |  |  |  | (853) |  | (844) |  | (963)
Net payments of interest and other financial expenses net of dividends received |  |  |  |  |  |  |  |  | (292) |  | (1,309) |  | (1,171)
Net interest and other financial expenses paid |  |  |  |  |  |  |  |  | (1,236) |  | (1,519) |  | (1,193)
Dividends received |  |  |  |  |  |  |  |  | 944 |  | 210 |  | 22
Taxes (paid)/proceeds |  |  |  |  |  |  |  |  | (92) |  | (459) |  | (509)
Net cash flow provided by operating activities |  |  |  |  |  |  |  |  | 11,763 |  | 10,268 |  | € 13,196
VMO2 |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received from joint ventures, classified as investing activities | € 439 | £ 385 | € 324 | £ 290 | € 146 | £ 125 | € 187 | £ 161 | € 909 | £ 800 | € 187 | £ 161 |

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- Definition The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_10&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 50 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_50_d&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of dividends received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2022-03-24 -Paragraph B12 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_B12_a&doctype=Appendix&subtype=B -URIDate 2022-03-24 + Details
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- Definition The cash inflow representing dividends received from joint ventures, classified as investing activities. [Refer: Joint ventures [member]; Dividends received] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_16&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The cash flows from income taxes paid or refunded, classified as operating activities. [Refer: Income taxes paid (refund)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 14 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_14_f&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The cash outflow for interest paid, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 31 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_31&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The cash outflow for operating activities that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 14 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_14&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The cash outflow to, and on behalf of, employees. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 14 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_14_d&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The cash outflow to suppliers for goods and services. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2022-03-24 -Paragraph 14 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_14_c&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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