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Pensions and other post-employment benefits - Defined benefit plans (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Pensions and Other Post-Employment Benefits    
Net defined benefit balance € 461 € 1,198
Benefit liabilities 4,440 5,000
Benefit assets € 3,979 € 3,802
Untied States, Germany and United Kingdom    
Pensions and Other Post-Employment Benefits    
Percentage of total defined benefit obligation (as a percent) 93.00% 93.00%
Percentage of total plan assets (as a percent) 91.00% 92.00%