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Net Finance Cost - Summary of Net Finance Costs (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about finance income expense [Line Items] |  |  |
Finance costs | € (672) | € 821 | € 718
Bank loans and overdrafts | (32) | (46) | (44)
Interest on bonds and other loans | (533) | (617) | (560)
Interest on lease liabilities | (82) | (100) | (127)
Net gain/(loss) on transactions for which hedge accounting is not applied | (25) | (58) | 13
Finance income | 232 | 224 | 135
Pensions and similar obligations | (9) | (30) | (25)
Net finance costs before non-underlying items | (449) | (627) | (608)
Interest related to the UK tax audit of intangible income and centralised services | (56) |  |
Net finance costs | (505) | (627) | (608)
Foreign exchange derivatives [member] |  |  |
Disclosure of detailed information about finance income expense [Line Items] |  |  |
Net gain/(loss) on transactions for which hedge accounting is not applied | 275 | (321) | 144
Exchange Differences On Underlying Items [Member] |  |  |
Disclosure of detailed information about finance income expense [Line Items] |  |  |
Net gain/(loss) on transactions for which hedge accounting is not applied | € (300) | € 263 | € (131)

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- Definition The amount of income associated with interest and other financing activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of income or cost associated with interest and other financing activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of interest expense on bank loans and overdrafts. [Refer: Interest expense; Bank overdrafts] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Finance costs excluding interest on tax audit. + References No definition available. + Details
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- Definition Interest expense on bonds and other loans. + References No definition available. + Details
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- Details
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