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Deferred tax liabilities (Details 2) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax liabilities € 10,169 € 10,953 € 10,780
Deferred tax assets, gross (13,609) (13,698) (12,307)
Impairments of deferred tax assets 5,262 5,622  
Deferred tax assets, net (8,347) (8,076) (7,208)
Net deferred tax liabilities 1,822 2,877 € 3,572
Accelerated Tax Depreciation [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax liabilities 8,323 8,899  
Difference Between The Fair Value And Carrying Amount of Assets Acquired [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax liabilities 1,106 1,269  
Site Restoration And Abandonment Tangible Assets [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax liabilities 305 348  
Application of the Weighted Average Cost Method in Evaluation of Inventories [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax liabilities 70 81  
Other Deferred Tax Liabilities Gross [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax liabilities 365 356  
Carry Forward Tax Losses [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets, gross (5,240) (4,722)  
Site Restoration And Abandonment Provisions For Contingencies [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets, gross (2,747) (2,881)  
Timing Differences On Depreciation And Amortization [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets, gross (2,164) (2,260)  
Accruals For Impairment Losses And Provisions For Contingencies [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets, gross (1,404) (1,413)  
Impairment Losses [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets, gross (801) (906)  
Over/Underlifting [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets, gross (395) (270)  
Employee Benefits [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets, gross (194) (163)  
Unrealized Intercompany Profits [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets, gross (130) (118)  
Other Deferred Tax Assets Gross [Member]      
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items]      
Deferred tax assets, gross € (534) € (965)