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Net Finance Cost - Summary of Net Finance Costs (Detail) - EUR (€) € in Millions	12 Months Ended
	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)

X

- 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
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The amount of income or cost associated with interest and other financing activities of the entity.

+ References

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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
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-IssueDate 2020-01-01
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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
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Line items represent detailed information about finance income expense.

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Finance costs excluding interest on tax audit.

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Interest charges related to the UK tax audit of intangible income and centralised services.

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Interest expense on bonds and other loans.

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Interest on pensions and other similar obligations.

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Net finance costs before non-underlying items.

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Net gains losses on transactions for which hedge accounting is not applied.

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