Trade receivables and other customer-related balances - Narrative (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair value of financial instruments
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets	€ (45)	€ (122)	€ 5
Receivables	13,213	15,799
Satisfied performance obligations	1,000	1,500
Discontinued Operations
Fair value of financial instruments
Satisfied performance obligations		100
Credit risk \| Total net receivables
Fair value of financial instruments
Receivables	5,835	6,003
Credit risk \| Total net receivables \| Accumulated impairment
Fair value of financial instruments
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets	50	137	16
Receivables	(183)	(226)
Credit risk \| Total net receivables \| Accumulated impairment \| Financial instruments credit-impaired
Fair value of financial instruments
Receivables	€ 30	62	€ 396
Reversal of impairment loss recognised in profit or loss		334
Decrease through write-off, financial assets		233
Increase (decrease) through modification of contractual cash flows, financial assets		€ 111

The decrease in contract liabilities resulting from the performance obligation being satisfied. [Refer: Contract liabilities; Performance obligations [domain]]

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities]

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