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Taxes - Income tax - Effective income tax on continuing operations - Additional information - Other reconciling items (Details) - EUR (€)
€ in Millions
1 Months Ended 12 Months Ended
Oct. 06, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]        
Tax on dividends in prior year (as a percent) 3.00%      
France tax group subsidiaries [member]        
Disclosure of subsidiaries [line items]        
Non-deductible interests     € 78 € 80
Tax income, resulting from dispute over 3% tax on dividends   € 304   € 304
Tax on dividends in prior year (as a percent)       3.00%