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Capital and Funding - Summary of Comprehensive Income Reconciliation (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Analysis Of Fair Value Reserves Remeasurement Of Pensions And Currency Translation Reserve [Abstract] |  |  |
1 January | € 110 | € (123) |
Gains/(losses) on equity instruments | 68 | 25 |
Gains/(losses) on cash flow hedges | 62 | 176 |
Hedging gains/(losses) transferred to non-financial assets | 10 | 32 |
31 December | 250 | 110 | € (123)
Remeasurement of defined benefit pension plans beginning balance | (1,146) | (1,499) |
Movement during the year | 215 | 353 | (328)
Remeasurement of defined benefit pension plans ending balance | (931) | (1,146) | (1,499)
Currency retranslation gains/(losses) beginning balance | (5,084) | (5,069) |
Other reserves | (2,356) | (18) |
Retained profit | (22) | 2 |
Non-controlling interest | (212) | 1 |
Currency retranslation gains/(losses) ending balance | € (7,674) | € (5,084) | € (5,069)

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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_91_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition A component of equity representing the reserve of gains and losses on financial assets measured at fair value through other comprehensive income. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Currency retranslation movement non-controlling interest. + References No definition available. + Details
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- Definition Currency retranslation value. + References No definition available. + Details
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- Definition Disclosure Of Analysis Of Fair Value Reserves Remeasurement Of Pensions And Currency Translation Reserve [Abstract] + References No definition available. + Details
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