Provisions - Present Value of the DBO and the Fair Value of the Plan Assets (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
PROVISIONS
Present value of the DBO	€ 1,357	€ 1,321
Thereof fully or partially funded plans	1,271	1,252
Thereof unfunded plans	86	69
Fair value of the plan assets	1,223	1,181
Net defined benefit liability (asset)	134	140
Non-current other financial assets	2	0
Non-current provisions	136	140
Domestic Plans
PROVISIONS
Present value of the DBO	857	854
Thereof fully or partially funded plans	857	854
Thereof unfunded plans	0	0
Fair value of the plan assets	848	843
Net defined benefit liability (asset)	9	11
Non-current other financial assets	0	0
Non-current provisions	9	11
Present value of the DBO provides for lumpsum Payments	794	789
Foreign Plans
PROVISIONS
Present value of the DBO	382	369
Thereof fully or partially funded plans	336	324
Thereof unfunded plans	46	45
Fair value of the plan assets	319	290
Net defined benefit liability (asset)	63	79
Non-current other financial assets	1	0
Non-current provisions	64	79
Present value of the DBO provides for Annuity Payments	329	316
Other Post Employment Plans
PROVISIONS
Present value of the DBO	118	98
Thereof fully or partially funded plans	78	74
Thereof unfunded plans	40	24
Fair value of the plan assets	56	48
Net defined benefit liability (asset)	62	50
Non-current other financial assets	1	0
Non-current provisions	€ 63	€ 50

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard
-URIDate 2017-03-09

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of non-current provisions for employee benefits. [Refer: Provisions for employee benefits]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_d&doctype=Standard
-URIDate 2017-03-09

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]]

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The present value, without deducting any plan assets, of expected future payments required to settle the obligation of plans that provide for annuity payments resulting from employee service in the current and prior periods.

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The present value, without deducting any plan assets, of expected future payments required to settle the obligation of plans that provide for lump-sum payments resulting from employee service in the current and prior periods.

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- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation of fully or partially funded plans resulting from employee service in the current and prior periods.

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The present value, without deducting any plan assets, of expected future payments required to settle the obligation of unfunded plans resulting from employee service in the current and prior periods.

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The amount of employee defined benefit plan assets that the entity presents as non-current other financial assets in the statement of financial position.

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