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Basis of preparation and significant accounting policies - Additional information (Details) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 EUR (€) country segment | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 EUR (€)
Disclosure of significant accounting policies [line items] |  |  |  |  |
Reconciliation net result effect of adjustment after tax EU IAS 39 carve-out | € (3,147) | € 8,451 |  | € 1,174 |
Total equity | € 55,628 | € 57,004 |  | 52,802 | € 52,640
Number of reportable segments | segment | 5 |  |  |  |
Level of price index | 1,859.38 | 1,128.45 |  |  |
Price index movements | 0.6477 | 0.6427 |  |  |
Minimum |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Number of countries in which entity operates | country | 40 |  |  |  |
Maximum | Software |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Useful life, intangible assets | 5 years |  |  |  |
Property | Minimum |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Useful life, property and equipment | 20 years |  |  |  |
Property | Maximum |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Useful life, property and equipment | 50 years |  |  |  |
- Data processing equipment | Minimum |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Useful life, property and equipment | 2 years |  |  |  |
- Data processing equipment | Maximum |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Useful life, property and equipment | 5 years |  |  |  |
Fixtures and fittings | Minimum |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Useful life, property and equipment | 4 years |  |  |  |
Fixtures and fittings | Maximum |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Useful life, property and equipment | 10 years |  |  |  |
Financial assets at amortised cost | Financial assets outside scope of IFRS 7, class |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Financial assets | € 538 | € 743 |  |  |
Adjustment |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Total equity |  | (46) | [1] | € 64 |
Adjustment | Financial assets at amortised cost | Financial assets outside scope of IFRS 7, class |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Total equity |  | (13) |  |  |
Adjustment | Increase (decrease) due to changes in accounting policy |  |  |  |  |
Disclosure of significant accounting policies [line items] |  |  |  |  |
Total equity |  | € (33) |  |  |
[1] | Changes in policy following the adoption of IFRS 17 and change in policy for non-financial guarantees.

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