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Employees - Summary of Assets, Liabilities and Surplus/ (Deficit) Position of Pension and Other Post-Employment Benefit Plans at Balance Sheet Date (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]    
Fair value of assets € 26,686 € 24,023
Defined benefit pension plans    
Disclosure of defined benefit plans [line items]    
Fair value of assets 26,686 24,023
Defined benefit obligation, at present value (23,219) (23,272)
Computed net assets/(liabilities) 3,467 751
Irrecoverable surplus (50) (26)
Net pension assets/(liabilities) 3,417 725
Defined benefit pension plans | Wholly Or Partly Funded Defined Benefit Plans, In Surplus    
Disclosure of defined benefit plans [line items]    
Fair value of assets 23,240 20,790
Defined benefit obligation, at present value (18,071) (18,043)
Computed net assets/(liabilities) 5,169 2,747
Irrecoverable surplus (50) (26)
Net pension assets/(liabilities) 5,119 2,721
Defined benefit pension plans | Wholly Or Partly Funded Defined Benefit Plans, In Deficit    
Disclosure of defined benefit plans [line items]    
Fair value of assets 3,446 3,233
Defined benefit obligation, at present value (4,245) (4,310)
Computed net assets/(liabilities) (799) (1,077)
Defined benefit pension plans | Wholly unfunded defined benefit plans    
Disclosure of defined benefit plans [line items]    
Defined benefit obligation, at present value (903) (919)
Other post- employment benefit plans    
Disclosure of defined benefit plans [line items]    
Fair value of assets 7 9
Defined benefit obligation, at present value (431) (447)
Computed net assets/(liabilities) (424) (438)
Irrecoverable surplus 0 0
Net pension assets/(liabilities) (424) (438)
Other post- employment benefit plans | Wholly Or Partly Funded Defined Benefit Plans, In Surplus    
Disclosure of defined benefit plans [line items]    
Fair value of assets 0 1
Defined benefit obligation, at present value 0 0
Computed net assets/(liabilities) 0 1
Irrecoverable surplus 0 0
Net pension assets/(liabilities) 0 1
Other post- employment benefit plans | Wholly Or Partly Funded Defined Benefit Plans, In Deficit    
Disclosure of defined benefit plans [line items]    
Fair value of assets 7 8
Defined benefit obligation, at present value (39) (40)
Computed net assets/(liabilities) (32) (32)
Other post- employment benefit plans | Wholly unfunded defined benefit plans    
Disclosure of defined benefit plans [line items]    
Defined benefit obligation, at present value € (392) € (407)