Financial Risk Factors and Risk Management - Designated Hedged Items in Interest Rate Hedges (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
FINANCIAL RISK FACTORS
Carrying amount	€ 13,668	€ 11,331
Interest Rate Risk \| Interest Rate Hedges \| Fixed-Rate Borrowing in EUR
FINANCIAL RISK FACTORS
Notional amount	3,750
Carrying amount	3,707
Accumulated fair value adjustments in Other financial liabilities	25
Change in value used for calculating hedge ineffectiveness	25
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	545
Carrying amount	545
Accumulated fair value adjustments in Other financial liabilities	(38)
Change in value used for calculating hedge ineffectiveness	(11)
Accumulated amount of fair value hedge adjustments for hedged items ceased to be adjusted for hedging gains/losses	€ (28)

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 2019-01-01
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-URIDate 2019-03-27

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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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-IssueDate 2019-01-01
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-URIDate 2019-03-27

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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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