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Taxation - Summary of Movements in Deferred Tax Asset (Liability) (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance € (1,692) € (1,237)  
Income statement 219 359  
Other (1,592) (814)  
Deferred tax asset (liability) ending balance (3,065) (1,692)  
Recognition of deferred tax assets 345   $ 345
Pensions and similar obligations      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance 80 272  
Income statement (73) (97)  
Other (661) (95)  
Deferred tax asset (liability) ending balance (654) 80  
Provisions and accruals      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance 698 756  
Income statement (11) 38  
Other 39 (96)  
Deferred tax asset (liability) ending balance 726 698  
Goodwill and intangible assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance (2,734) (2,096)  
Income statement 249 23  
Other (963) (661)  
Deferred tax asset (liability) ending balance (3,448) (2,734)  
Accelerated tax depreciation      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance (641) (685)  
Income statement 33 9  
Other 8 35  
Deferred tax asset (liability) ending balance (600) (641)  
Tax losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance 190 184  
Income statement (2) 32  
Other (16) (26)  
Deferred tax asset (liability) ending balance 172 190  
Fair value gains      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance (52) (50)  
Income statement 19 12  
Other (27) (14)  
Deferred tax asset (liability) ending balance (60) (52)  
Fair value losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance 45 15  
Income statement 1 (6)  
Other (44) 36  
Deferred tax asset (liability) ending balance 2 45  
Share-based payments      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance 146 156  
Income statement 7 (30)  
Other 13 20  
Deferred tax asset (liability) ending balance 166 146  
Lease liability      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance 294 319  
Income statement (16) 9  
Other 17 (34)  
Deferred tax asset (liability) ending balance 295 294  
Right of use asset      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance (244) (269)  
Income statement 21 (4)  
Other (21) 29  
Deferred tax asset (liability) ending balance (244) (244)  
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset (liability) beginning balance 526 161  
Income statement (9) 373  
Other 63 (8)  
Deferred tax asset (liability) ending balance € 580 € 526