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Deferred tax assets and liabilities (Details 2) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax liabilities € 7,956 € 10,169 € 10,953
Deferred tax assets, gross 7,615 8,347  
Accumulated write-downs of deferred tax assets 5,741 5,262  
Deferred tax assets, net (7,615) (8,347)  
Accelerated Tax Depreciation [Member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax liabilities 6,612 8,323  
Difference between the fair value and the carrying amount of assets acquired [Member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax liabilities 849 1,106  
Site restoration and abandonment (tangible assets) [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax liabilities 85 305  
Application of the weighted average cost method in evaluation of inventories [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax liabilities 44 70  
Other [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax liabilities 366 365  
Carry-forward tax losses [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax assets, gross (5,528) (5,240)  
Site restoration and abandonment (provisions for contingencies) [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax assets, gross (1,986) (2,747)  
Timing differences on depreciation and amortization [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax assets, gross (2,104) (2,164)  
Accruals for impairment losses and provisions for contingencies [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax assets, gross (1,460) (1,404)  
Impairment losses [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax assets, gross (792) (801)  
Over/Under lifting [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax assets, gross (604) (395)  
Employee benefits [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax assets, gross (212) (194)  
Unrealized intercompany profits [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax assets, gross (124) (130)  
Other [member]      
Disclosure Of Deferred Taxes Liabilities [Line Items]      
Deferred tax assets, gross € (546) € (534)