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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, 2022
Dec. 31, 2021
Deferred tax liabilities before offsetting    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year € 10,668 € 8,581
Additions 1,176 1,977
Deductions (1,351) (765)
Changes with effect to OCI 382  
Currency translation differences 611 683
Changes in scope of consolidation (1,951)  
Other changes (220) 192
Deferred tax liability (asset) at end of year 9,315 10,668
Deferred tax assets before offsetting, gross    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year (17,150) (16,231)
Additions (2,215) (1,783)
Deductions 2,532 1,804
Changes with effect to OCI (147)  
Currency translation differences (610) (682)
Changes in scope of consolidation 2,279  
Other changes 351 (258)
Deferred tax liability (asset) at end of year (14,960) (17,150)
Accumulated impairment    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year 8,604 9,065
Additions 464 270
Deductions (2,409) (863)
Currency translation differences 165 186
Changes in scope of consolidation (549)  
Other changes (105) (54)
Deferred tax liability (asset) at end of year 6,170 8,604
Deferred tax assets before offsetting net of accumulated write-down provisions    
Deferred tax assets and liabilities    
Deferred tax liability (asset) at beginning of year (8,546) (7,166)
Additions (1,751) (1,513)
Deductions 123 941
Changes with effect to OCI (147)  
Currency translation differences (445) (496)
Changes in scope of consolidation 1,730  
Other changes 246 (312)
Deferred tax liability (asset) at end of year € (8,790) € (8,546)