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Deferred tax assets and liabilities - Significant temporary differences (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Temporary differences    
Deferred tax liabilities before offsetting € 8,581 € 9,583
Deferred tax assets (7,166) (9,023)
Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (16,231) (15,767)
Accumulated impairment    
Temporary differences    
Deferred tax assets 9,065 6,744
Accelerated tax depreciation    
Temporary differences    
Deferred tax liabilities before offsetting 6,171 6,796
Leasing    
Temporary differences    
Deferred tax liabilities before offsetting 1,089 1,375
Leasing | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (1,113) (1,385)
Difference between the fair value and the carrying amount of assets acquired    
Temporary differences    
Deferred tax liabilities before offsetting 415 617
Site restoration and abandonment (tangible assets)    
Temporary differences    
Deferred tax liabilities before offsetting 199 126
Application of the weighted average cost method in evaluation of inventories    
Temporary differences    
Deferred tax liabilities before offsetting 56 97
Other temporary differences    
Temporary differences    
Deferred tax liabilities before offsetting 651 572
Other temporary differences | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (593) (740)
Unused tax losses | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (6,983) (6,065)
Site restoration and abandonment (provisions for contingencies) | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (2,211) (2,242)
Timing differences on depreciation and amortization | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (2,206) (2,022)
Accruals for impairment losses and provisions for contingencies | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (1,371) (1,513)
Impairment losses | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (1,213) (946)
Employee benefits | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (213) (209)
Over/Under lifting | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets (211) (525)
Unrealized intercompany profits | Deferred tax assets, gross    
Temporary differences    
Deferred tax assets € (117) € (120)