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Financial Risk Factors and Risk Management - Interest Rate Sensitivity (Details) - Interest Rate - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivatives held within a designated fair value hedge relationship      
FINANCIAL RISK FACTORS      
Upward yield curve € (58) € (11) € (6)
Downward yield curve 5 10 10
Variable rate financing      
FINANCIAL RISK FACTORS      
Effect of upward shift in exchange rates, assets, on financial income, net (14) (4) (1)
Effect of downward shift in exchange rates, assets, on financial income, net € 1 € 3 € 1
U.S. dollar      
FINANCIAL RISK FACTORS      
Downward yield curve (as a percent) 25.00%    
U.S. dollar | Interest Rate Risk      
FINANCIAL RISK FACTORS      
Upward yield curve (as a percent) 75.00% 75.00% 50.00%
Downward yield curve (as a percent) 25.00% 25.00% 50.00%
Upward shift, assets (in percent) 75.00% 75.00% 50.00%
Downward shift, assets (in percent) 25.00% 25.00% 50.00%
EUR | Interest Rate Risk      
FINANCIAL RISK FACTORS      
Upward yield curve (as a percent) 125.00% 20.00% 10.00%
Downward yield curve (as a percent) 10.00% 20.00% 20.00%
Upward shift, assets (in percent) 125.00% 20.00% 10.00%
Downward shift, assets (in percent) 10.00% 20.00% 20.00%