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Property, Plant and Equipment - Summary of Movements in Leased Assets (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance € 12,062  
Ending balance 10,558 € 12,062
Assets Under Lease [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,813  
Ending balance 1,649 1,813
Cost [Member] | Assets Under Lease [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 3,701 3,586
Acquisitions of group companies 33  
Additions 579 452
Disposals and other movements (624) (420)
Hyperinflationary adjustment (3) 23
Currency retranslation (279) 60
Ending balance 3,407 3,701
Accumulated depreciation [Member] | Assets Under Lease [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,888) (1,712)
Depreciation charge for the year (457) (456)
Disposals and other movements 450 304
Hyperinflationary adjustment   9
Currency retranslation 137 (33)
Ending balance (1,758) (1,888)
Land and buildings [Member] | Assets Under Lease [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,477  
Ending balance 1,328 1,477
Land and buildings [Member] | Cost [Member] | Assets Under Lease [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,874 2,770
Acquisitions of group companies 30  
Additions 390 278
Disposals and other movements (436) (240)
Hyperinflationary adjustment (3) 23
Currency retranslation (216) 43
Ending balance 2,639 2,874
Land and buildings [Member] | Accumulated depreciation [Member] | Assets Under Lease [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,397) (1,241)
Depreciation charge for the year (315) (297)
Disposals and other movements 300 154
Hyperinflationary adjustment   9
Currency retranslation 101 (22)
Ending balance (1,311) (1,397)
Plant and equipment [Member] | Assets Under Lease [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 336  
Ending balance 321 336
Plant and equipment [Member] | Cost [Member] | Assets Under Lease [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 827 816
Acquisitions of group companies 3  
Additions 189 174
Disposals and other movements (188) (180)
Currency retranslation (63) 17
Ending balance 768 827
Plant and equipment [Member] | Accumulated depreciation [Member] | Assets Under Lease [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (491) (471)
Depreciation charge for the year (142) (159)
Disposals and other movements 150 150
Currency retranslation 36 (11)
Ending balance € (447) € (491)