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Financial Assets at FVPL/Available-for-Sale Financial Investments - Additional Information (Detail) € / shares in Units, ₱ in Millions, € in Millions, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
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Dec. 20, 2018 USD ($) | Dec. 15, 2018 USD ($) | Dec. 14, 2018 | May 23, 2018 EUR (€) shares | May 04, 2018 PHP (₱) shares | May 04, 2018 EUR (€) shares | Apr. 16, 2018 € / shares shares | Feb. 27, 2018 PHP (₱) | Aug. 04, 2017 PHP (₱) | Aug. 04, 2017 USD ($) | Mar. 10, 2016 PHP (₱) | Mar. 10, 2016 USD ($) | Sep. 03, 2015 USD ($) | Aug. 11, 2015 PHP (₱) | Aug. 11, 2015 USD ($) | Apr. 23, 2015 PHP (₱) | Apr. 23, 2015 USD ($) | Oct. 02, 2014 | Feb. 28, 2015 | Aug. 31, 2014 PHP (₱) | Nov. 30, 2010 PHP (₱) shares | Sep. 30, 2018 PHP (₱) shares | Sep. 30, 2018 EUR (€) shares | Dec. 31, 2018 PHP (₱) | Dec. 31, 2017 PHP (₱) | Dec. 31, 2016 PHP (₱) | Mar. 20, 2019 € / shares | Dec. 15, 2018 PHP (₱) | Dec. 18, 2015 USD ($) | Sep. 04, 2015 USD ($) | Oct. 01, 2014 € / shares | Aug. 31, 2014 EUR (€)
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 07, 2014 |  |  |  |  |  |  |  |
Percentage of ownership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of shares buyback pursuant to share buyback Program | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,720,000 |  |  |  |  |  |  |  |  |  |  |
Total consideration pursuant to share buyback program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 6,505.0 |  |  |  |  |  |  |  |  |  |  |
Impairment recognized in profit or loss (Note 11) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 540.0 | ₱ 5,381.0 |  |  |  |  |  |
Purchase of available-for-sale financial investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76.0 | 3,500.0 |  |  |  |  |  |
Fair value of investment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 4,763.0 |  |  |  |  |  |  |  |
Rocket Internet S E [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current financial assets available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 19,577.0 |  |  |  |  |  |  |  |  |  |  |  | € 333
Percentage of ownership |  |  |  |  |  |  | 67.40% |  |  |  |  |  |  |  |  |  |  | 6.60% | 6.10% |  |  |  |  |  |  |  |  |  |  |  |  |
Initial public offering | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 42.50 |
Offering price per share | € / shares |  |  |  |  |  |  | € 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of shares committed to accept offer | shares |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares accepted against tender | shares |  |  |  |  | 7,000,000 | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration pursuant to share buyback program |  |  |  |  | ₱ 10,059.0 | € 163 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed | shares |  |  |  | 10,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reducing share capital | € |  |  |  | € 154 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Shares Sold | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 | 700,000 |  |  |  |  |  |  |  |  |
Aggregate amount against shares sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,346.0 | € 22 |  |  |  |  |  |  |  |  |
Decline in value below cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Impairment of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,045.0) |  |  |  |  |  |  |
Impairment recognized in profit or loss (Note 11) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 540.0 | ₱ 5,381.0 |  |  |  |  |  |
Total cumulative valuation loss on investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ (157.0) |  |  |  |  |  |  |  |
Fair value of investment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,128.0 |  |  |  |  |  |  |  |
Rocket Internet S E [Member] | Change in fair value of investment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing price per share at end of the year (in Euros) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 22.90 |  |  |  |  |
Rocket Internet S E [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares buyback pursuant to share buyback Program | shares |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  | 2.10% | 6.10% | 6.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.10% | 2.10% |  |  |  |  |  |  |  |  |
Rocket Internet S E [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.70% | 1.70% |  |  |  |  |  |  |  |  |
IFlix Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership |  | 5.30% | 7.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of available-for-sale financial investments |  |  |  |  |  |  |  |  | ₱ 75.0 | $ 1.5 |  |  |  |  |  | ₱ 686.0 | $ 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible note held | $ |  | $ 1.5 |  |  |  |  |  |  |  |  |  | $ 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to ordinary shares |  |  |  |  |  |  |  |  |  |  | ₱ 20.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation gain |  |  |  |  |  |  |  |  |  |  | 898.0 | 19.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increasing fair value of investment |  |  |  |  |  |  |  |  |  |  | ₱ 1,584.0 | $ 34.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of online investment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 844.0 | ₱ 1,841.0 |  |  |  |  |  |  |
Fair value of investment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 844.0 |  |  |  |  |  |  |  |
IFlix Limited [Member] | Series B Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1.0 |  |  |  |
Phunware, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of subscribed promissory note in associate |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of subscribed promissory note issued by associate | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory note payable | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.0 |  |
Business combination enterprise value |  |  |  |  |  |  |  | ₱ 301.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares conversion ratio |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 497.0 |  |  |  |  |  |  |  |
Phunware, Inc [Member] | Series F Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of total consideration of preferred shares subscribed | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.0 |  |  |
Matrixx Software, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of available-for-sale financial investments |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 237.0 | $ 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal of financial assets at fair value through profit or loss | $ | $ 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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