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Post-employment benefits - Plan assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Post-employment benefits [Line Items]        
Interest expense (income), net defined benefit liability (asset)   € 13 € 22 € 23
Current service cost, net defined benefit liability (asset) € 42      
Plan assets [member]        
Post-employment benefits [Line Items]        
Net defined benefit liability (asset) at beginning of period € 1,403 2,526 2,164  
Interest expense (income), net defined benefit liability (asset)   58 77  
Current service cost, net defined benefit liability (asset)   1 1  
Return on plan assets, net defined benefit liability (asset)   268 305  
Contributions to plan by plan participants, net defined benefit liability (asset)   15 12  
Contributions to plan by employer, net defined benefit liability (asset)   34 28  
Gains (losses) arising from settlements, net defined benefit liability (asset)   (1,205) (1)  
Payments from plan, net defined benefit liability (asset)   221 159  
Increase (decrease) through changes in foreign exchange rates, net defined benefit liability (asset)   (71) 103  
Net defined benefit liability (asset) at end of period   € 1,403 € 2,526 € 2,164