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Details of treasury and other financial risks - Estimated transaction exposure and related hedges (Detail) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure € 4,707 € 5,233
Hedge of transaction exposure 3,149 3,292
Payables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 1,489 1,606
Hedge of transaction exposure   € 1,244
Payables cash flow [Member] | Cash flow hedges [member]    
Details of treasury and other financial risks [Line Items]    
Hedge of transaction exposure 1,268  
US Dollar [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 1,915  
Hedge of transaction exposure (1,356)  
US Dollar [Member] | Payables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 900  
Hedge of transaction exposure 799  
Yen [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 689  
Hedge of transaction exposure 372  
Yen [Member] | Payables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 9  
Hedge of transaction exposure 9  
Pound Sterling [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 304  
Hedge of transaction exposure 180  
Pound Sterling [Member] | Payables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 11  
Hedge of transaction exposure 11  
Yuan Renminbi [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 438  
Hedge of transaction exposure 290  
Yuan Renminbi [Member] | Payables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 146  
Hedge of transaction exposure 145  
Canadian Dollar [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 256  
Hedge of transaction exposure 156  
Zloty [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 155  
Hedge of transaction exposure 92  
Australian Dollar [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 229  
Hedge of transaction exposure 130  
Swiss Franc [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 124  
Hedge of transaction exposure 68  
Swiss Franc [Member] | Payables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 10  
Hedge of transaction exposure 10  
Czech Koruna [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 67  
Hedge of transaction exposure 42  
Swedish Krona [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 88  
Hedge of transaction exposure 53  
Swedish Krona [Member] | Payables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure (1)  
Hedge of transaction exposure 1  
Russian Ruble [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 87  
Russian Ruble [Member] | Receivables cash flow [Member] | Cash flow hedges [member]    
Details of treasury and other financial risks [Line Items]    
Hedge of transaction exposure 87  
Others [Member] | Receivables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 355  
Hedge of transaction exposure 323  
Others [Member] | Payables cash flow [Member]    
Details of treasury and other financial risks [Line Items]    
Transaction exposure 412  
Hedge of transaction exposure € 293