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Significant accounting policies - Balance sheet impact of IFRS 9 and IFRS 15 adoption (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Significant accounting policies - Text Details (Detail) [Line Items]        
Trade and other current receivables € 4,035 € 3,911 € 3,909  
Current tax assets, current 147 110 109  
Current prepayments and other current assets 469 317 392  
Investments in subsidiaries, joint ventures and associates 244 149 142  
Deferred tax assets 1,828 1,593 1,598  
Current contract liabilities 1,303 [1] 1,150 1,163  
Non-current contract liabilities 226 [1] 237 249  
Deferred tax liabilities 152 18 33  
Equity attributable to owners of parent € 12,088 11,970 € 11,999 € 12,546
IFRS 15 adoption impact [member]        
Significant accounting policies - Text Details (Detail) [Line Items]        
Trade and other current receivables   1    
Current tax assets, current   1    
Current prepayments and other current assets   (75)    
Investments in subsidiaries, joint ventures and associates   7    
Deferred tax assets   5    
Current contract liabilities   (13)    
Non-current contract liabilities   (12)    
Deferred tax liabilities   15    
Equity attributable to owners of parent   (29)    
After presentation change [Member]        
Significant accounting policies - Text Details (Detail) [Line Items]        
Trade and other current receivables [2]   3,909    
Current tax assets, current [2]   109    
Current prepayments and other current assets [2]   392    
Investments in subsidiaries, joint ventures and associates [2]   142    
Deferred tax assets [2]   1,598    
Current contract liabilities [2],[3]   1,163    
Non-current contract liabilities [2],[3]   249    
Deferred tax liabilities [2]   33    
Equity attributable to owners of parent [2]   € 11,999    
[1] Due to IFRS 15 adoption, contractual liabilities are shown as separate captions on the balance sheet as of 2018. For more details refer to the Significant accounting policies.
[2] Opening balance sheet after IFRS 15 presentation change, before other IFRS 15 and IFRS 9 adjustments.
[3] Opening balance sheet after IFRS 15 presentation change.