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Assets and Liabilities Held for Sale - Summary of Assets and Liabilities Classified as Held for Sale (Parenthetical) (Detail) - EUR (€) € in Billions |  | 6 Months Ended
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Jul. 02, 2018 | Jun. 30, 2018
'South Africa spreads business [member] |  |
Non-current Assets Held for Sale [Line Items] |  |
Completion date |  | Jul. 02, 2018
Global spreads business (excluding South Africa) [member] |  |
Non-current Assets Held for Sale [Line Items] |  |
Completion date |  | Jul. 02, 2018
Global spreads business (excluding South Africa) [member] | Disposal of business [member] |  |
Non-current Assets Held for Sale [Line Items] |  |
Consideration paid (received) | € (7.3) |

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- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 40 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_40_a&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Agreement completion date + References No definition available. + Details
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- Definition Non-current Assets Held for Sale [Line Items] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
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Period Type: |