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Post-employment benefits - Defined-benefit obligations (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Post-employment benefits [Line Items]        
Current service cost, net defined benefit liability (asset) € 42      
Interest expense (income), net defined benefit liability (asset)   € 13 € 22 € 23
Present value of defined benefit obligation [member]        
Post-employment benefits [Line Items]        
Net defined benefit liability (asset) at beginning of period € 2,153 3,350 2,998  
Current service cost, net defined benefit liability (asset)   39 36  
Interest expense (income), net defined benefit liability (asset)   71 99  
Contributions to plan by plan participants, net defined benefit liability (asset)   15 12  
Actuarial gains (losses) arising from changes in demographic assumptions, net defined benefit liability (asset)   16 (52)  
Actuarial gains (losses) arising from changes in financial assumptions, net defined benefit liability (asset)   163 304  
Actuarial gains (losses) arising from experience adjustments, net defined benefit liability (asset)   39 29  
Past service cost, net defined benefit liability (asset)   2 0  
Gains (losses) arising from settlements, net defined benefit liability (asset)   (1,185) (5)  
Payments from plan, net defined benefit liability (asset)   (221) (159)  
Benefits paid directly by employer   (35) (41)  
Increase (decrease) through changes in foreign exchange rates, net defined benefit liability (asset)   (100) 130  
Net defined benefit liability (asset) at end of period   € 2,153 € 3,350 € 2,998