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Financial Assets at FVPL - Summary of Details on Investment in Rocket (Detail) - Rocket Internet S E [Member] € / shares in Units, ₱ in Millions, € in Millions | 12 Months Ended
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Dec. 31, 2020 PHP (₱) | Dec. 31, 2019 PHP (₱) | Dec. 31, 2019 EUR (€) € / shares | Dec. 31, 2018 PHP (₱) | Dec. 31, 2018 EUR (€) € / shares
Disclosure Of Financial Assets [Line Items] |  |  |  |  |
Total market value as at beginning of the year (in million pesos) | ₱ 2,381 | ₱ 3,128 |  |  |
Total market value as at end of the year (in million Euros) |  | 2,381 |  | ₱ 3,128 |
Fair value adjustment in profit or loss |  | 89 |  |  |
Disposal of investments | (2,381) | (836) |  |  |
Rocket [Member] |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |
Total market value as at beginning of the year (in million pesos) | ₱ 2,381 | 3,128 | € 52 | 12,848 |
Closing price per share at end of the year (in Euros) | € / shares |  |  | € 22.10 |  | € 20.18
Total market value as at end of the year (in million Euros) |  | 2,381 | € 42 | 3,128 | € 52
Net gains (losses) recognized during the year (in million pesos) |  | ₱ 89 |  | ₱ (157) |

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