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Property, Plant and Equipment - Summary of Movements in Leased Assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period € 10,558  
Property, plant and equipment at end of period 10,347 € 10,558
Lease assets    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period 1,649  
Property, plant and equipment at end of period 1,514 1,649
Cost | Lease assets    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period 3,407 3,701
Additions through business combinations 4 33
Additions 373 579
Disposals and other movements (504) (624)
Hyperinflationary adjustment (18) (3)
Reclassification as held for sale (64)  
Currency retranslation 130 (279)
Property, plant and equipment at end of period 3,328 3,407
Accumulated depreciation | Lease assets    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period (1,758) (1,888)
Depreciation charge for the year (430) (457)
Disposals and other movements 410 450
Reclassification as held for sale 35  
Currency retranslation (71) 137
Property, plant and equipment at end of period (1,814) (1,758)
Land and buildings | Lease assets    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period 1,328  
Property, plant and equipment at end of period 1,206 1,328
Land and buildings | Cost | Lease assets    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period 2,639 2,874
Additions through business combinations 4 30
Additions 263 390
Disposals and other movements (259) (436)
Hyperinflationary adjustment (18) (3)
Reclassification as held for sale (61)  
Currency retranslation 99 (216)
Property, plant and equipment at end of period 2,667 2,639
Land and buildings | Accumulated depreciation | Lease assets    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period (1,311) (1,397)
Depreciation charge for the year (307) (315)
Disposals and other movements 177 300
Reclassification as held for sale 33  
Currency retranslation (53) 101
Property, plant and equipment at end of period (1,461) (1,311)
Plant and equipment | Lease assets    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period 321  
Property, plant and equipment at end of period 308 321
Plant and equipment | Cost | Lease assets    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period 768 827
Additions through business combinations 0 3
Additions 110 189
Disposals and other movements (245) (188)
Hyperinflationary adjustment 0 0
Reclassification as held for sale (3)  
Currency retranslation 31 (63)
Property, plant and equipment at end of period 661 768
Plant and equipment | Accumulated depreciation | Lease assets    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Property, plant and equipment at beginning of period (447) (491)
Depreciation charge for the year (123) (142)
Disposals and other movements 233 150
Reclassification as held for sale 2  
Currency retranslation (18) 36
Property, plant and equipment at end of period € (353) € (447)