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Commitments and Contingent Liabilities - Summary of Detailed Information about Property Plant and Equipment (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | € 10,411 | € 11,673 |
Cost [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | 19,398 | 21,207 | € 19,917
Accumulated depreciation [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | (8,987) | (9,534) | (8,859)
Plant and equipment [member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | 7,378 | 8,411 |
Plant and equipment [member] | Cost [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | 14,936 | 16,462 | 15,366
Plant and equipment [member] | Accumulated depreciation [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | (7,558) | (8,051) | € (7,416)
Finance Leases [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | 139 | 151 |
Finance Leases [Member] | Cost [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | 331 | 345 |
Finance Leases [Member] | Accumulated depreciation [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | (192) | (194) |
Finance Leases [Member] | Buildings [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | 122 | 132 |
Finance Leases [Member] | Buildings [Member] | Cost [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | 206 | 211 |
Finance Leases [Member] | Buildings [Member] | Accumulated depreciation [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | (84) | (79) |
Finance Leases [Member] | Plant and equipment [member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | 17 | 19 |
Finance Leases [Member] | Plant and equipment [member] | Cost [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | 125 | 134 |
Finance Leases [Member] | Plant and equipment [member] | Accumulated depreciation [Member] |  |  |
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items] |  |  |
Property plant and equipment | € (108) | € (115) |

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- Definition 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. + References No definition available. + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2016-01-13 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2016-03-30&anchor=para_73_e&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_a&doctype=Standard -URIDate 2016-03-31 + Details
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- Details
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- Details
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