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Fair Value Disclosures on Financial Instruments - Reconciliation of Level 3 Fair Values (Details) - Unlisted Equity Investments and Call Options on Equity Shares - Fair Value - Measured at Fair Value on a Recurring Basis - Level 3 - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Level 3 Fair Values    
Assets at the beginning of the period € 722 € 568
Transfers Into Level 3 0 18
Transfers Out of Level 3 (100) (18)
Purchases 257 156
Sales (102) (168)
Gains/losses - Included in financial income, net in profit and loss 26 96
Assets at the end of the period 742 722
Change in unrealized gains/losses in profit and loss for investments held at the end of the reporting period 0 0
Available-for-sale financial assets    
Reconciliation of Level 3 Fair Values    
Gains/losses - Included in other comprehensive income 28 48
Exchange differences    
Reconciliation of Level 3 Fair Values    
Gains/losses - Included in other comprehensive income € (89) € 22