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Post-employment benefits - Post-employment benefits (Detail) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Post-employment benefits [Line Items]      
Present value of funded obligations € 1,521 € 2,684  
Present value of unfunded obligations 633 666  
Post-employement benefit [Member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) 750 824  
Present value of defined benefit obligation [member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) 2,153 3,350 € 2,998
Plan assets [member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) 1,403 2,526 € 2,164
United States of America [Member]      
Post-employment benefits [Line Items]      
Present value of funded obligations (568) 1,738  
Present value of unfunded obligations 141 148  
Net defined benefit liability (asset)   143  
United States of America [Member] | Post-employement benefit [Member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) 95    
United States of America [Member] | Present value of defined benefit obligation [member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) 709 1,886  
United States of America [Member] | Plan assets [member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) 613 1,743  
Germany [Member]      
Post-employment benefits [Line Items]      
Present value of funded obligations 649 630  
Present value of unfunded obligations 344 351  
Net defined benefit liability (asset) 450 457  
Germany [Member] | Present value of defined benefit obligation [member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) 993 981  
Germany [Member] | Plan assets [member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) 543 524  
Other countries [Member]      
Post-employment benefits [Line Items]      
Present value of funded obligations (304) 317  
Present value of unfunded obligations 147 166  
Net defined benefit liability (asset) 205 224  
Other countries [Member] | Present value of defined benefit obligation [member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) 451 484  
Other countries [Member] | Plan assets [member]      
Post-employment benefits [Line Items]      
Net defined benefit liability (asset) € 247 € 259