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Fair Value Disclosures on Financial Instruments - Reconciliation of Level 3 Fair Values (Details) - Fair Value - Measured at Fair Value on a Recurring Basis - Level 3 - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Unlisted equity securities and call options on equity shares    
Reconciliation of Level 3 Fair Values    
Assets at the beginning of the period € 4,883 € 4,881
Transfers Into Level 3 9 0
Transfers Out of Level 3 (8) (25)
Purchases 417 522
Sales (101) (43)
Gains/losses - Included in financial income, net (219) (789)
Assets at the end of the period 4,817 4,883
Change in unrealized gains/losses in profit and loss for investments held at the end of the reporting period 532 (788)
Deal contingent forward    
Reconciliation of Level 3 Fair Values    
Assets at the beginning of the period 0  
Transfers Into Level 3   0
Transfers Out of Level 3   0
Purchases   0
Sales   0
Settlements 91 0
Gains/losses - Included in financial income, net (106) 0
Assets at the end of the period 0 0
Change in unrealized gains/losses in profit and loss for investments held at the end of the reporting period 0 0
Exchange differences | Unlisted equity securities and call options on equity shares    
Reconciliation of Level 3 Fair Values    
Gains/losses - Included in exchange differences in other comprehensive income (164) 337
Exchange differences | Deal contingent forward    
Reconciliation of Level 3 Fair Values    
Gains/losses - Included in exchange differences in other comprehensive income € 15 € 0