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Income taxes - Expiry of tax losses and unused tax credits (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, Recognized € 3,439 € 2,304
Tax losses carried forward, Unrecognized 18,324 19,393
Total tax losses carried forward 21,763 21,697
Tax credits, Recognized 249 258
Tax credits, Unrecognized 311 342
Total tax credits 560 600
Undistributed earnings, deferred tax liability not recognized 388 422
Within 10 years    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, Recognized 1,344 132
Tax losses carried forward, Unrecognized 1,247 2,508
Total tax losses carried forward 2,591 2,640
Tax credits, Recognized 85 32
Tax credits, Unrecognized 286 325
Total tax credits 371 357
Thereafter    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, Unrecognized 4 3
Total tax losses carried forward 4 3
Tax credits, Recognized 47 49
Tax credits, Unrecognized 4 4
Total tax credits 51 53
No expiry    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, Recognized 2,095 2,172
Tax losses carried forward, Unrecognized 17,073 16,882
Total tax losses carried forward 19,168 19,054
Tax credits, Recognized 117 177
Tax credits, Unrecognized 21 13
Total tax credits € 138 € 190