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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, 2022
Dec. 31, 2021
Pension plans    
Disclosure of defined benefit plans [line items]    
Fair value of assets € 19,361 € 26,686
Present value of liabilities (16,199) (23,219)
Computed surplus/(deficit) 3,162 3,467
Irrecoverable surplus (234) (50)
Surplus/(deficit) 2,928 3,417
Pension plans | Wholly or partly funded defined benefit plans, in surplus    
Disclosure of defined benefit plans [line items]    
Fair value of assets 16,524 23,240
Present value of liabilities (12,030) (18,071)
Computed surplus/(deficit) 4,494 5,169
Irrecoverable surplus (234) (50)
Surplus/(deficit) 4,260 5,119
Pension plans | Wholly or partly funded defined benefit plans, in deficit    
Disclosure of defined benefit plans [line items]    
Fair value of assets 2,837 3,446
Present value of liabilities (3,417) (4,245)
Surplus/(deficit) (580) (799)
Pension plans | Wholly unfunded defined benefit plans    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (752) (903)
Other post- employment benefit plans    
Disclosure of defined benefit plans [line items]    
Fair value of assets 6 7
Present value of liabilities (365) (431)
Computed surplus/(deficit) (359) (424)
Irrecoverable surplus 0 0
Surplus/(deficit) (359) (424)
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 0
Present value of liabilities 0 0
Computed surplus/(deficit) 0 0
Irrecoverable surplus 0 0
Surplus/(deficit) 0 0
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 6 7
Present value of liabilities (39) (39)
Surplus/(deficit) (33) (32)
Other post- employment benefit plans | Wholly unfunded defined benefit plans    
Disclosure of defined benefit plans [line items]    
Present value of liabilities € (326) € (392)