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Employees - Schedule of Cash Flow in Respect of Pensions and Similar Post-employment Benefits (Detail) - EUR (€)
€ in Millions
 121 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Employee Benefit Plan [Line Items]        
Group cash flow in respect of pensions and similar benefits   € 561 € 1,300 € 699
Funded Plans [Member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit   238 954 355
Defined contributions   179 195 187
Unfunded Plans [Member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit   € 144 € 151 € 157
Future estimate [member]        
Disclosure of Employee Benefit Plan [Line Items]        
Group cash flow in respect of pensions and similar benefits € 565      
Future estimate [member] | Funded Plans [Member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit 230      
Defined contributions 185      
Future estimate [member] | Unfunded Plans [Member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit € 150