Financial Risk Factors and Risk Management - Contractual Maturities of Derivative Financial Liabilities and Financial Assets (Details) - EUR (€) € in Millions	Dec. 31, 2018	Dec. 31, 2017
FINANCIAL RISK FACTORS
Derivative financial liabilities	€ (76)	€ (86)
Derivative financial assets	113	93
Total of derivative financial liabilities and assets	37	8
2019
FINANCIAL RISK FACTORS
Derivative financial assets	61	65
Total of derivative financial liabilities and assets	0	12
2019 \| Cash outflows
FINANCIAL RISK FACTORS
Net cashflow	(8)	(12)
2019 \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	19	25
Expiring after the following year
FINANCIAL RISK FACTORS
Derivative financial assets	1	13
Total of derivative financial liabilities and assets	(11)	(5)
Expiring after the following year \| Cash outflows
FINANCIAL RISK FACTORS
Net cashflow	(14)	(43)
Expiring after the following year \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	15	56
Not designated as hedging instruments \| Foreign Currency
FINANCIAL RISK FACTORS
Derivative financial liabilities	(64)	(84)
Derivative financial assets	100	41
Not designated as hedging instruments \| Interest Rate Risk
FINANCIAL RISK FACTORS
Derivative financial liabilities	0	0
Designated as hedging instruments \| Foreign Currency
FINANCIAL RISK FACTORS
Derivative financial liabilities	(9)	(1)
Derivative financial assets	2	29
Designated as hedging instruments \| Interest Rate Risk
FINANCIAL RISK FACTORS
Derivative financial liabilities	3	1
Derivative financial assets	11	24
Designated as hedging instruments \| Interest Rate Risk \| 2019 \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	13	8
Designated as hedging instruments \| Interest Rate Risk \| Expiring after the following year \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	26	14
Financial liabilities \| 2019
FINANCIAL RISK FACTORS
Derivative financial liabilities	(61)	(53)
Financial liabilities \| Expiring after the following year
FINANCIAL RISK FACTORS
Derivative financial liabilities	(12)	(18)
Financial liabilities \| Not designated as hedging instruments \| Foreign Currency \| 2019 \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	(2,111)	(3,909)
Financial liabilities \| Not designated as hedging instruments \| Foreign Currency \| 2019 \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	2,062	3,857
Financial liabilities \| Not designated as hedging instruments \| Foreign Currency \| Expiring after the following year \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	(11)	(309)
Financial liabilities \| Not designated as hedging instruments \| Foreign Currency \| Expiring after the following year \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	0	292
Financial liabilities \| Designated as hedging instruments \| Foreign Currency \| 2019 \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	(340)	(75)
Financial liabilities \| Designated as hedging instruments \| Foreign Currency \| 2019 \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	(330)	(74)
Financial liabilities \| Designated as hedging instruments \| Foreign Currency \| Expiring after the following year \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	0	0
Financial liabilities \| Designated as hedging instruments \| Foreign Currency \| Expiring after the following year \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	0	0
Financial liabilities \| Designated as hedging instruments \| Interest Rate Risk \| 2019 \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	(15)	(8)
Financial liabilities \| Designated as hedging instruments \| Interest Rate Risk \| Expiring after the following year \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	(27)	(15)
Financial assets \| Not designated as hedging instruments \| Foreign Currency \| 2019 \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	(4,025)	(2,799)
Financial assets \| Not designated as hedging instruments \| Foreign Currency \| 2019 \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	4,076	2,831
Financial assets \| Not designated as hedging instruments \| Foreign Currency \| Expiring after the following year \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	0	0
Financial assets \| Not designated as hedging instruments \| Foreign Currency \| Expiring after the following year \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	0	0
Financial assets \| Designated as hedging instruments \| Interest Rate Risk \| 2019 \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	(203)	(634)
Financial assets \| Designated as hedging instruments \| Interest Rate Risk \| 2019 \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	202	654
Financial assets \| Designated as hedging instruments \| Interest Rate Risk \| Expiring after the following year \| Cash outflows
FINANCIAL RISK FACTORS
Cashflow	0	0
Financial assets \| Designated as hedging instruments \| Interest Rate Risk \| Expiring after the following year \| Cash inflows
FINANCIAL RISK FACTORS
Cashflow	€ 0	€ 0

The amount of contractual undiscounted cash flows in relation to contractual amounts to be exchanged in a derivative financial instrument for which gross cash flows are exchanged. [Refer: Derivatives [member]]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph B11D
-Subparagraph d
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- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard
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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of contractual undiscounted cash flows in relation to derivative financial liabilities. [Refer: Derivative financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 39
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_39_b&doctype=Standard
-URIDate 2018-03-16

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The amount of contractual undiscounted cash flows in relation to financial liabilities, including, bank borrowings, bonds and private placements.

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The amount of contractual undiscounted cash flows in relation to derivative financial assets (liabilities).

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