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Revenue recognition - Performance obligations (Details) - EUR (€)
€ in Millions
1 Months Ended
Apr. 30, 2014
Dec. 31, 2019
Dec. 31, 2018
Performance obligations      
Remaining performance obligation   € 18,800 € 21,100
Remaining performance obligation (as a percent)   100.00% 100.00%
IAS 18 Agreement      
Performance obligations      
Term of non-exclusive license to patents 10 years    
Deferred revenue   € 670 € 825
2020      
Performance obligations      
Remaining performance obligation (as a percent)   69.00% 59.00%
Due between 1 and 3 years      
Performance obligations      
Remaining performance obligation (as a percent)   27.00% 34.00%
More than 3 years      
Performance obligations      
Remaining performance obligation (as a percent)   4.00% 7.00%