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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, 2022
Dec. 31, 2021
Reconciliation of Level 3 Fair Values    
Assets at the beginning of the period € 4,881 € 2,508
Transfers Into Level 3 0 0
Transfers Out of Level 3 (25) (455)
Purchases 522 1,076
Sales (43) (852)
Gains/losses - Included in financial income, net (789) 2,348
Assets at the end of the period 4,883 4,881
Change in unrealized gains/losses in profit and loss for investments held at the end of the reporting period (788) 1,789
Exchange differences    
Reconciliation of Level 3 Fair Values    
Gains/losses - Included in exchange differences in other comprehensive income € 337 € 256