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Employees - Summary of Cash Flow in Respect of Pensions and Similar Post-employment Benefits (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Employee Benefit Plan [Line Items]        
Group cash flow in respect of pensions and similar benefits   € 1,300 € 699 € 710
Funded Plans [member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit   954 355 356
Defined contributions   195 187 197
Unfunded Plans [member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit   € 151 € 157 € 157
Estimate [member]        
Disclosure of Employee Benefit Plan [Line Items]        
Group cash flow in respect of pensions and similar benefits € 600      
Estimate [member] | Funded Plans [member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit 245      
Defined contributions 205      
Estimate [member] | Unfunded Plans [member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit € 150