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Income taxes - Expiry of tax losses and unused tax credits (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, recognized € 3,621 € 3,439
Tax losses carried forward, unrecognized 19,482 18,324
Total tax losses carried forward 23,103 21,763
Tax credits, recognized 345 249
Tax credits, unrecognized 344 311
Total tax credits 689 560
Within 10 years    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, recognized 1,375 1,344
Tax losses carried forward, unrecognized 1,025 1,247
Total tax losses carried forward 2,400 2,591
Tax credits, recognized 143 85
Tax credits, unrecognized 329 286
Total tax credits 472 371
Thereafter    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, recognized 17 0
Tax losses carried forward, unrecognized 0 4
Total tax losses carried forward 17 4
Tax credits, recognized 48 47
Tax credits, unrecognized 1 4
Total tax credits 49 51
No expiry    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, recognized 2,229 2,095
Tax losses carried forward, unrecognized 18,457 17,073
Total tax losses carried forward 20,686 19,168
Tax credits, recognized 154 117
Tax credits, unrecognized 14 21
Total tax credits € 168 € 138