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Financial Risk Factors and Risk Management - Equity Price Risk Management (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Equity Price Risk      
FINANCIAL RISK FACTORS      
Equity price risk € 4,967 € 5,137 € 5,799
Marketable equity investments | Equity Price      
FINANCIAL RISK FACTORS      
Upward shift, assets (in percent) 22.00% 22.00% 22.00%
Downward shift, assets (in percent) 22.00% 22.00% 22.00%
Upward shift, assets € 1,093 € 503 € 515
Downward shift, assets € (1,093) € (503) € (515)