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Income taxes - Expiry of tax losses and unused tax credits (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, recognized € 3,402 € 3,621
Tax losses carried forward, unrecognized 19,770 19,482
Total tax losses carried forward 23,172 23,103
Tax credits, recognized 324 345
Tax credits, unrecognized 273 344
Total tax credits 597 689
Within 10 years    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, recognized 1,356 1,375
Tax losses carried forward, unrecognized 1,022 1,025
Total tax losses carried forward 2,378 2,400
Tax credits, recognized 126 143
Tax credits, unrecognized 254 329
Total tax credits 380 472
Thereafter    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, recognized 74 17
Tax losses carried forward, unrecognized 0 0
Total tax losses carried forward 74 17
Tax credits, recognized 45 48
Tax credits, unrecognized 4 1
Total tax credits 49 49
No expiry    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, recognized 1,972 2,229
Tax losses carried forward, unrecognized 18,748 18,457
Total tax losses carried forward 20,720 20,686
Tax credits, recognized 153 154
Tax credits, unrecognized 15 14
Total tax credits € 168 € 168