Income Taxes - Income Tax Charged or Credited to Equity (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Taxes [Abstract]
Actuarial gains (losses) related to defined benefit plans	€ (145)	€ (115)	€ 137
Net fair value gains (losses) attributable to credit risk related to financial liabilities designated as at fair value through profit or loss	30	54	18
Financial assets mandatory at fair value through other comprehensive income:
Unrealized net gains (losses) arising during the period	(169)	113	59
Realized net gains (losses) arising during the period (reclassified to profit or loss)	10	13	1
Derivatives hedging variability of cash flows:
Unrealized net gains (losses) arising during the period	12	73	(132)
Net gains (losses) reclassified to profit or loss	16	(64)	(110)
Other equity movement:
Unrealized net gains (losses) arising during the period	15	141	151
Net gains (losses) reclassified to profit or loss	0	6	0
Income taxes credited (charged) to other comprehensive income	(231)	221	124
Other income taxes credited (charged) to equity	€ 235	€ 104	€ 50

Derivatives hedging variability of cash flows, Income Tax Charged or Credited to Equity

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Financial assets mandatory at fair value through other comprehensive income:

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Income Taxes [Abstract]

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No definition available.

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- Definition

NetFairValueGainsLossesAttributableToCreditRiskRelatedToFinancialLiabilitiesDesignatedAsAtFairValueThroughProfitOrLossIncomeTaxCharged

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No definition available.

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- Definition

Net gains/losses reclassified to profit or loss, Derivatives hedging variability of cash flows

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No definition available.

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Net gains/losses reclassified to profit or loss, Other equity movement

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No definition available.

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Other equity movement, Income Tax Charged or Credited to Equity

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No definition available.

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RealizedNetGainsLossesArisingDuringThePeriodReclassifiedToProfitOrLossIncomeTaxCharged

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Unrealized net gains/losses arising during the period, Derivatives hedging variability of cash flows

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No definition available.

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UnrealizedNetGainsLossesArisingDuringThePeriodIncomeTaxCharged

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- Definition

Unrealized net gains/losses arising during the period, Other equity movement

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No definition available.

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- Definition

The aggregate current and deferred tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Deferred tax relating to items credited (charged) directly to equity; Retained earnings; Classes of financial instruments [domain]]

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [domain]]

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