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Capital and Funding - Summary of Consolidated Statement of Changes in Equity: Analysis of Other Reserves (Detail) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of reserves within equity [abstract] |  |  |  |  |  |
Fair value reserves |  | € 250 |  | € 110 |  | € (123)
Currency retranslation of group companies |  | (7,068) |  | (4,712) |  | (4,694)
Adjustment on translation of PLC's ordinary capital | [1] |  |  | (148) |  | (150)
Capital redemption reserve |  | 21 |  | 37 |  | 32
Book value of treasury shares – see following table |  | (483) | [2] | (703) | [2] | (10,181)
Other | [3] | (202) |  | (158) |  | (102)
Other reserves |  | € (7,482) |  | € (5,574) |  | € (15,218)
[1] | Prior to Unification, a conversion rate of £1 = €5.143 was used in accordance with the Equalisation Agreement, which ceased to exist as a result of Unification. The ordinary share capital of PLC is now translated using the conversion rate at 29 November 2020 of £1 = € 1.121. The difference between the conversion rates was released through Other Reserves as presented in the “Other effects of Unification” line in the Statement of Changes in Equity.
[2] | Shortly before Unification 4,523,367 NV and PLC ordinary shares, 892,155 NV NYRSs and 468,989 PLC ADSs held by NV in connection with share-based compensation plans were transferred to an employee share ownership trust at their carrying value. See note 4C for details.
[3] | Relates to the options to purchase non-controlling interest in subsidiaries and hyperinflation adjustment arising on current year profit translated at closing exchange rate.

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