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Income Tax - Summary of Income Tax Reconciliation Using Composite Statutory Income Tax Rate Applicable by Tax Jurisdictions (Parenthetical) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of tax reconciliation using composite statutory income tax rate applicable by tax jurisdictions [line Items]            
Income tax rate       31.90% 24.90% 38.20%
Change in tax rate       € (11) € (6)  
United States [member]            
Disclosure of tax reconciliation using composite statutory income tax rate applicable by tax jurisdictions [line Items]            
Income tax rate     27.00% 40.00% 40.00% 40.00%
Change in tax rate       € (16)    
France [member]            
Disclosure of tax reconciliation using composite statutory income tax rate applicable by tax jurisdictions [line Items]            
Income tax rate 25.82% 28.92%   39.20% 34.43% 38.00%