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Income taxes - Expiry of tax losses and unused tax credits (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, Recognized € 4,045 € 3,147
Tax losses carried forward, Unrecognized 18,757 18,449
Total tax losses carried forward 22,802 21,596
Tax credits, Recognized 464 513
Tax credits, Unrecognized 108 37
Total tax credits 572 550
Undistributed earnings for which no deferred tax liability has been recognized 709 1,578
Within 10 years    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, Recognized 2,195 1,338
Tax losses carried forward, Unrecognized 1,698 1,491
Total tax losses carried forward 3,893 2,828
Tax credits, Recognized 249 367
Tax credits, Unrecognized 92 21
Total tax credits 341 388
Thereafter    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, Recognized 353 135
Tax losses carried forward, Unrecognized 58 25
Total tax losses carried forward 411 160
Tax credits, Recognized 204 111
Tax credits, Unrecognized 5 5
Total tax credits 209 116
No expiry    
Expiry of tax losses carried forward and unused tax credits    
Tax losses carried forward, Recognized 1,497 1,674
Tax losses carried forward, Unrecognized 17,001 16,933
Total tax losses carried forward 18,498 18,608
Tax credits, Recognized 11 35
Tax credits, Unrecognized 11 11
Total tax credits € 22 € 46