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Pensions and other post-employment benefits - Defined benefit plans (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pensions and Other Post-Employment Benefits      
Defined benefit plan costs € 31 € 234 € 214
Defined contribution plan costs 220 246 € 231
Net defined benefit balance 487 (103)  
Benefit liabilities 4,343 4,327  
Benefit assets € 4,830 € 4,224  
Untied States, Germany and United Kingdom      
Pensions and Other Post-Employment Benefits      
Percentage of total defined benefit obligation (as a percent) 92.00% 92.00%  
Percentage of total plan assets (as a percent) 91.00% 91.00%