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Taxation - Summary of Deferred Tax Assets and Liabilities (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets € 1,085 € 1,354  
Liabilities (1,913) (2,061)  
Total (828) (707) € (559)
More than 1 year [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets 730 1,157  
Liabilities (1,868) (2,206)  
Total (1,138) (1,049)  
Pensions and similar obligations [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets 294 568  
Liabilities 22 198  
Total 316 766 557
Provisions and accruals [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets 465 579  
Liabilities 188 343  
Total 653 922 708
Goodwill and intangible assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets 86 2  
Liabilities (1,738) (1,930)  
Total (1,652) (1,928) (1,301)
Accelerated tax depreciation [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets (21) (60)  
Liabilities (658) (810)  
Total (679) (870) (752)
Tax losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets 125 128  
Liabilities 5 3  
Total 130 131 123
Fair value gains [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets 23 28  
Liabilities 77 (35)  
Total 100 (7) (25)
Fair value losses [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets 3 9  
Liabilities 21 20  
Total 24 29 16
Share-based payments [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets 74 44  
Liabilities 120 125  
Total 194 169 190
Other [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Assets 36 56  
Liabilities 50 25  
Total € 86 € 81 € (75)