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Note 25 Sensitivity analysis (Details) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Discount rate sensitivity analysis [Member] |  |  |
Sensitivity analysis [Line Items] |  |  |
Basis points change sensitivity analysis | 0.50% |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | € (265) | € (321) | € (282)
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption | € 291 | 350 | 307
Rate of salary increase sensitivity analysis [Member] |  |  |
Sensitivity analysis [Line Items] |  |  |
Basis points change sensitivity analysis | 0.50% |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | € 4 | 1 | 2
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption | € (4) | (1) | (2)
Rate of pension increase sensitivity analysis [Member] |  |  |
Sensitivity analysis [Line Items] |  |  |
Basis points change sensitivity analysis | 0.50% |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | € 34 | 32 | 28
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption | € (32) | (39) | (26)
Medical cost trend rate sensitivity analysis [Member] |  |  |
Sensitivity analysis [Line Items] |  |  |
Basis points change sensitivity analysis | 0.50% |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | € 141 | 119 | 109
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption | € (126) | (106) | (98)
Change in obligation from each additional year of longevity [Member] |  |  |
Sensitivity analysis [Line Items] |  |  |
Basis points change sensitivity analysis |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | € 134 | 113 | 170
Decrease In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption | € 0 | € 0 | € 0

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + Details
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