Other liabilities - Disclosure of analysis of other liabilities by due date (Details) - EUR (€) € in Millions	Dec. 31, 2025	Dec. 31, 2024
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Other liabilities (excluding Accrued expenses, deferred income and service contract liability)	€ 15,440	€ 14,911
Due within one year
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Other liabilities (excluding Accrued expenses, deferred income and service contract liability)	12,198	11,830
Due between one and five years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Other liabilities (excluding Accrued expenses, deferred income and service contract liability)	3,201	3,038
Due beyond five years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Other liabilities (excluding Accrued expenses, deferred income and service contract liability)	41	43
Total due after one year (Non-Current)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Other liabilities (excluding Accrued expenses, deferred income and service contract liability)	€ 3,242	€ 3,081