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Financial Risk Factors and Risk Management - Equity Price Risk Management (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity Price Risk      
FINANCIAL RISK FACTORS      
Equity price risk € 1,996 € 1,248 € 827
Marketable equity investments | Equity Price      
FINANCIAL RISK FACTORS      
Upward shift, assets (in percent) 10.00% 10.00% 10.00%
Downward shift, assets (in percent) 10.00% 10.00% 10.00%
Upward shift, assets € 156 € 65 € 56
Downward shift, assets € (156) € (65) € (56)
Share-based payment expenses | Equity Price      
FINANCIAL RISK FACTORS      
Upward shift, liabilities (in percent) 20.00% 20.00% 20.00%
Downward shift, liabilities (in percent) 20.00% 20.00% 20.00%
Upward shift, liabilities € (298) € (279) € (371)
Downward shift, liabilities 307 262 337
Offsetting gains from hedging instruments | Equity Price      
FINANCIAL RISK FACTORS      
Upward shift, assets 48 57 65
Downward shift, assets € 46 € 44 € 46