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Deferred tax assets and liabilities - Changes in deferred tax liabilities and assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Deferred tax liabilities, gross    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year € 9,583 € 7,956
Additions 960 1,265
Deductions (1,326) (1,205)
Currency translation differences (725) 194
Other changes 89 (97)
Deferred tax liability (asset) at end of year 8,581 9,583
Deferred tax liabilities, gross | Increase (decrease) due to application of IFRS 16    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year   1,470
Deferred tax liabilities, gross | After initial application    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year   9,426
Deferred tax assets, gross    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year (15,767) (13,356)
Additions (2,649) (2,091)
Deductions 1,357 1,407
Currency translation differences 742 (182)
Other changes 86 (75)
Deferred tax liability (asset) at end of year (16,231) (15,767)
Deferred tax assets, gross | Increase (decrease) due to application of IFRS 16    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year   (1,470)
Deferred tax assets, gross | After initial application    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year   (14,826)
Accumulated impairment    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year 6,744 5,741
Additions 2,638 1,161
Deductions (130) (174)
Currency translation differences (192) 34
Other changes 5 (18)
Deferred tax liability (asset) at end of year 9,065 6,744
Accumulated impairment | After initial application    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year   5,741
Deferred tax assets net of impairment before offsetting    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year (9,023) (7,615)
Additions (11) (930)
Deductions 1,227 1,233
Currency translation differences 550 (148)
Other changes 91 (93)
Deferred tax liability (asset) at end of year € (7,166) (9,023)
Deferred tax assets net of impairment before offsetting | Increase (decrease) due to application of IFRS 16    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year   (1,470)
Deferred tax assets net of impairment before offsetting | After initial application    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year   € (9,085)