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Provisions, income tax liabilities and other liabilities - Reconciliation of Net Amount Recognized in Respect of Pension and Other Post-employment Benefit Plans (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]        
Actuarial losses/(gains) due to changes in financial assumptions € 654 € 686 [1] € (267) [1]  
Pre-funded pension obligations 269 408 177  
Obligations provided for 5,822 6,430 6,998 € 7,125
UK        
Disclosure of net defined benefit liability (asset) [line items]        
Actuarial losses/(gains) due to changes in demographic assumptions (54) (125) 14  
Actuarial losses/(gains) due to changes in financial assumptions (1,143) (77) 442  
Remeasurement of net defined-benefit (asset)/liability (actuarial gains and losses) (131) 237 (115)  
Pensions and other post-employment benefits        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period 2,539 3,099    
Current service cost 193 227 221  
Interest (income)/cost 43 42 55  
Plan amendments, curtailments or settlements not specified in the terms of the plan (68) 5 (199)  
Administration costs and taxes paid during the period (6) (7) (14)  
Contributions from plan members 6 6 7  
Net obligation 1,752 2,524 3,098  
Pre-funded pension obligations 269 408 177  
Expense recognized directly in profit or loss 168 276 84  
End of period 1,770 2,539 3,099  
Remeasurement of net defined-benefit (asset)/liability (actuarial gains and losses) (650) (685) 266  
Expense/(gain) for the period (482) (409) 350  
Pensions and other post-employment benefits | UK        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period (215) 25    
Current service cost 0 0 0  
Contributions from plan members 0 0 0  
Pre-funded pension obligations 99 220    
Expense recognized directly in profit or loss (13) 6 5  
End of period (95) (215) 25  
Remeasurement of net defined-benefit (asset)/liability (actuarial gains and losses) 130 (236) 115  
Pensions and other post-employment benefits | Present value of defined benefit obligation        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period 12,175 12,456 13,094  
Current service cost 193 227 221  
Interest (income)/cost 206 148 192  
Actuarial losses/(gains) due to changes in demographic assumptions (219) (162) 52  
Actuarial losses/(gains) due to changes in financial assumptions (3,006) (210) 936  
Actuarial losses/(gains) due to experience adjustments 177 (120) (26)  
Plan amendments, curtailments or settlements not specified in the terms of the plan (229) (4) (938)  
Plan settlements specified in the terms of the plan (84) (66) (75)  
Benefits paid (463) (503) (545)  
Changes in scope of consolidation and transfers (114) (8) (12)  
Currency translation differences 15 417 (443)  
End of period 8,651 12,175 12,456  
Pensions and other post-employment benefits | Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period (9,651) (9,358) (9,651)  
Interest (income)/cost (163) (106) (138)  
Plan amendments, curtailments or settlements not specified in the terms of the plan 161 9 739  
Plan settlements specified in the terms of the plan 84 66 75  
Changes in scope of consolidation and transfers 32 6 0  
Currency translation differences 52 (344) 326  
Difference between actual return and interest income on plan assets (2,398) 207 696  
Administration costs and taxes paid during the period (6) (7) (14)  
Contributions from plan members 6 6 6  
Employer’s contributions 238 176 490  
Benefits paid (426) (458) (469)  
End of period (6,899) (9,651) (9,358)  
Pensions and other post-employment benefits | Effect of asset ceiling        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning of period 15 1    
End of period 18 15 1  
Provisions for pensions and other post-employment benefits        
Disclosure of net defined benefit liability (asset) [line items]        
Obligations provided for 2,039 2,947 3,276 € 3,599
Provisions for pensions and other post-employment benefits | Pensions and other post-employment benefits        
Disclosure of net defined benefit liability (asset) [line items]        
Obligations provided for € 2,039 € 2,947 € 3,276  
[1] Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.