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Introduction, Presentation and Other Information - Leases (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Jun. 30, 2019
Jan. 01, 2019
Jun. 30, 2018
Dec. 31, 2017
Disclosure of initial application of standards or interpretations [line items]          
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16     4.50%    
Operating lease commitments at December 31, 2018 € 8,699        
Amount of operating lease commitments discounted by the Group rate 6,550        
Liabilities under financial leases at December 31, 2018 96        
Short-term leases recognised as expenses on a straight-line basis (20)        
Low-value leases recognised as expenses on a straight-line basis (2)        
Adjustments resulting from different treatment of extension and termination options 556        
Lease liabilities 7,180        
Equity 107,361 € 109,985   € 104,445 € 106,833
Increase Decrease Due To Application Of IFRS16 [Member]          
Disclosure of initial application of standards or interpretations [line items]          
Right-of-use assets 6,665        
Financial liabilities. 7,084        
Equity € (391)        
Common Equity Tier One Capital Ratio, Fully Loaded (0.20%)