Financial Risk Factors and Risk Management - Designated Hedged Items in Interest Rate Hedges (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
FINANCIAL RISK FACTORS
Carrying amount	€ 11,331	€ 6,264
Interest Rate Risk \| Interest Rate Hedges \| Fixed-Rate Borrowing in EUR
FINANCIAL RISK FACTORS
Notional amount	750
Carrying amount	749
Accumulated fair value adjustments in Other financial liabilities	10
Change in value used for calculating hedge ineffectiveness	10
Accumulated amount of fair value hedge adjustments for hedged items ceased to be adjusted for hedging gains / losses	0
Interest Rate Risk \| Interest Rate Hedges \| Fixed-Rate Borrowing in USD
FINANCIAL RISK FACTORS
Notional amount	535
Carrying amount	534
Accumulated fair value adjustments in Other financial liabilities	(32)
Change in value used for calculating hedge ineffectiveness	1
Accumulated amount of fair value hedge adjustments for hedged items ceased to be adjusted for hedging gains / losses	€ (33)

The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as a liability. [Refer: Hedged items [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 24B
-Subparagraph a
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-URIDate 2018-03-16

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- Definition

The accumulated amount of fair value hedge adjustment remaining in the statement of financial position for a hedged item that is a financial liability measured at amortised cost and has ceased to be adjusted for hedging gains and losses. [Refer: Financial liabilities at amortised cost; Hedged items [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The change in the amount of value used for calculating hedge effectiveness.

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