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Defined Benefit Plans - Summary of Amounts Recognized in Statement of Financial Positions (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Present value of wholly or partly funded obligations | € 4,807 | € 4,027 |
Fair value of plan assets | (4,420) | (3,525) |
Surplus Deficit In Plan | 386 | 502 |
Present value of wholly unfunded obligations 1) | 3,973 | 3,487 |
Ending Balance | 4,359 | 3,989 | € 3,950
Retirement Benefit Plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Present value of wholly or partly funded obligations | 4,807 | 4,027 |
Fair value of plan assets | (4,420) | (3,525) |
Surplus Deficit In Plan | 386 | 502 |
Present value of wholly unfunded obligations 1) | 3,690 | 3,212 |
Ending Balance | 4,076 | 3,714 | 3,657
Other Post Employment Benefit Plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Present value of wholly unfunded obligations 1) | 283 | 275 |
Ending Balance | € 283 | € 275 | € 293

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- Definition Unfunded defined benefit obligation present value. + References No definition available. + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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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 deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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