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Employees - Schedule of Cash Flow in Respect of Pensions and Similar Post-employment Benefits (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Employee Benefit Plan [Line Items]        
Group cash flow in respect of pensions and similar benefits   € 601 € 594 € 561
Funded Plans [Member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit [1]   266 244 238
Defined contributions   203 193 179
Unfunded Plans [Member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit   € 132 € 157 € 144
Future estimate [member]        
Disclosure of Employee Benefit Plan [Line Items]        
Group cash flow in respect of pensions and similar benefits € 640      
Future estimate [member] | Funded Plans [Member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit [1] 285      
Defined contributions 220      
Future estimate [member] | Unfunded Plans [Member]        
Disclosure of Employee Benefit Plan [Line Items]        
Defined benefit € 135      
[1] Following the conclusion of the 2019 Funding valuation of the US Unicare Pension Plan, the Group contributed $100 million into the plan in 2020. Deficit contributions to the US Pension plan are expected to be nil for the following few years.