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Financial assets at fair value through other comprehensive income - Summary of changes in fair value through other comprehensive income financial assets (Details) - Financial Assets At Fair Value Through Other Comprehensive Income Category [Member] - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Disclosure Of Financial Assets [Line Items]    
Financial assets € 30,635 € 35,895
Additions 10,500 13,186
Amortisation (10) (46)
Transfers and reclassifications 1 (7)
Changes in unrealised revaluations (2,178) (1,296)
Impairments (14) (5)
Reversals of impairments 5 4
Disposals and redemptions (8,638) (17,750)
Exchange rate differences 444 651
Changes in the composition of the group and other changes 0 2
Financial assets 30,745 30,635
Equity securities [member]    
Disclosure Of Financial Assets [Line Items]    
Financial assets 2,457 1,862
Additions 9 518
Transfers and reclassifications 1 (7)
Changes in unrealised revaluations 32 (88)
Disposals and redemptions (490) (19)
Exchange rate differences 56 191
Changes in the composition of the group and other changes 0 0
Financial assets 2,065 2,457
Debt instruments [member]    
Disclosure Of Financial Assets [Line Items]    
Financial assets 28,178 34,033
Additions 10,491 12,669
Amortisation (10) (46)
Transfers and reclassifications 0  
Changes in unrealised revaluations (2,210) (1,209)
Impairments (14) (5)
Reversals of impairments 5 4
Disposals and redemptions (8,148) (17,730)
Exchange rate differences 388 460
Changes in the composition of the group and other changes 0 2
Financial assets € 28,681 € 28,178