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New and amended standards and interpretations - Reconciliation (Details) - EUR (€)
€ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of initial application of standards or interpretations [line items]      
Lease liabilities € 1,030   € 1,066
Adjustment upon adoption of IFRS 16      
Disclosure of initial application of standards or interpretations [line items]      
Weighted average discount rate (as a percent)   2.60%  
Operating lease commitment disclosed as of December 31, 2018     € 1,099
Effect of discounting   € (83)  
Discounted IAS 17 lease commitment as at January 1, 2019   1,016  
Lease extension options reasonably certain to be exercised   266  
Non-lease components included in the lease liability   41  
Leases where commencement date is after January 1, 2019   (238)  
Lease commitments related to short-term leases   (21)  
Other   2  
Lease liabilities   € 1,066