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Pensions and other post-employment benefits - Defined benefit plans (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pensions and Other Post-Employment Benefits      
Defined contribution plan costs € 246 € 231 € 236
Defined benefit plan costs 234 214 € 222
Net defined benefit balance 103 461  
Benefit liabilities 4,327 4,440  
Benefit assets € 4,224 € 3,979  
Untied States, Germany and United Kingdom      
Pensions and Other Post-Employment Benefits      
Percentage of total defined benefit obligation (as a percent) 92.00% 93.00%  
Percentage of total plan assets (as a percent) 91.00% 91.00%