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Financial Risk Factors and Risk Management - Foreign Currency Exchange Rate Risk Sensitivity (Details) - Foreign currency - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Euro and all major currencies      
FINANCIAL RISK FACTORS      
Upward/downward shift 10.00% 10.00% 10.00%
Derivatives held within a designated cash flow hedge relationship      
FINANCIAL RISK FACTORS      
Upward/downward shift 10.00% 10.00% 10.00%
Effect of downward shift in exchange rates on other comprehensive income € 106 € 43 € 53
Effect of upward shift of exchange rate on other comprehensive income € (106) € (43) € (53)
Embedded derivatives      
FINANCIAL RISK FACTORS      
Upward/downward shift 10.00% 10.00% 10.00%
Effect of downward shift in exchange rates on other non-operating expense, net € 40 € 40 € 53
Effect of upward shift in exchange rates on other non-operating expense, net € (49) € (49) € (53)