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Accounting policies - Additional Information (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Accounting policies [line items]        
Operating lease rentals   € 533 € 513  
Weighted average incremental borrowing rate       3.95%
Property, plant and equipment excluding leased right-of-use assets € 15,954      
Property, plant and equipment as a % of assets   43.00%    
Cumulative Cash Flow Target [member]        
Accounting policies [line items]        
Percentage of awards granted 50.00%      
TSR measure [member]        
Accounting policies [line items]        
Percentage of awards granted 25.00% 50.00% 50.00%  
TSR measure [member] | Tailored sector peer group [member]        
Accounting policies [line items]        
Percentage of awards granted 25.00%      
TSR measure [member] | FTSE All-World Construction & Materials index [member]        
Accounting policies [line items]        
Percentage of awards granted 25.00%      
New RONA measure [Member]        
Accounting policies [line items]        
Percentage of awards granted 25.00%      
Plant and machinery [member] | Minimum [member]        
Accounting policies [line items]        
Rate of depreciation 3.30%      
Plant and machinery [member] | Maximum [member]        
Accounting policies [line items]        
Rate of depreciation 20.00%      
Transport [member] | Average [member]        
Accounting policies [line items]        
Rate of depreciation 20.00%      
Buildings [member]        
Accounting policies [line items]        
Rate of depreciation 2.50%