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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, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]    
Fair value of assets € 20,178 € 19,367
Pension plans    
Disclosure of defined benefit plans [line items]    
Fair value of assets 20,174 19,361
Present value of liabilities (17,174) (16,199)
Computed surplus/(deficit) 3,000 3,162
Irrecoverable surplus (255) (234)
Surplus/(deficit) 2,745 2,928
Pension plans | Wholly or partly funded defined benefit plans, in surplus    
Disclosure of defined benefit plans [line items]    
Fair value of assets 17,775 16,524
Present value of liabilities (13,739) (12,030)
Computed surplus/(deficit) 4,036 4,494
Irrecoverable surplus (255) (234)
Surplus/(deficit) 3,781 4,260
Pension plans | Wholly or partly funded defined benefit plans, in deficit    
Disclosure of defined benefit plans [line items]    
Fair value of assets 2,399 2,837
Present value of liabilities (2,715) (3,417)
Surplus/(deficit) (316) (580)
Pension plans | Wholly unfunded defined benefit plans    
Disclosure of defined benefit plans [line items]    
Present value of liabilities (720) (752)
Other post- employment benefit plans    
Disclosure of defined benefit plans [line items]    
Fair value of assets 4 6
Present value of liabilities (348) (365)
Computed surplus/(deficit) (344) (359)
Irrecoverable surplus 0 0
Surplus/(deficit) (344) (359)
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 4 6
Present value of liabilities (39) (39)
Surplus/(deficit) (35) (33)
Other post- employment benefit plans | Wholly unfunded defined benefit plans    
Disclosure of defined benefit plans [line items]    
Present value of liabilities € (309) € (326)