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Shareholders' Equity - Summary of Issued Share Capital and Reserves Attributable to Shareholders (Parenthetical) (Detail) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of issued share capital and reserves attributable to shareholders [line items]        
Revaluation reserve € (4,477) € 6,442    
Other reserves 997 € 325 € (553) € 456
Discontinued operations [member] | The Netherlands [member]        
Summary of issued share capital and reserves attributable to shareholders [line items]        
Revaluation reserve (676)      
Reserve of remeasurements of defined benefit plans (624)      
Other reserves € 14