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Goodwill and Intangible Assets - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2017 EUR (€) Product_Category GeographicalAreas | Dec. 31, 2016 EUR (€)
Disclosure of detailed information about intangible assets [Line Items] |  |
Number of product categories included in cash generating units | Product_Category | 4 |
Number of geographical areas included in cash generating units | GeographicalAreas | 3 |
Goodwill not allocated to cash generating units | € 2,405,000,000 |
Goodwill | € 16,881,000,000 | € 17,624,000,000
Pre-tax discount rate | 7.40% | 7.40%
Projection period | 5 years |
Spreads business [member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Goodwill | € 2,228,000,000 |
Indefinite-life intangible assets | 82,000,000 |
Goodwill [member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Impairment charges | 0 |
Indefinite-life intangible assets [member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Impairment charges | € 0 |
Top of range [member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Amortisation period of finite-life intangible assets | Ten years |

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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2016-01-13 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2016-03-30&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2016-01-13 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2016-03-30&anchor=para_134_a&doctype=Standard -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2016-01-13 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2016-03-30&anchor=para_135_a&doctype=Standard -URIDate 2016-03-31 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_54_c&doctype=Standard -URIDate 2016-03-31 + Details
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