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Equity - Summary of Number of Shares of Subscribed and Outstanding Capital Stock (Parenthetical) (Detail) - PHP (₱) ₱ in Millions, shares in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 28, 2014 | Jan. 29, 2013 | Dec. 31, 2018
Series IV Cumulative Non-Convertible Redeemable Preferred Stock [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Number of shares issued |  |  | 300
Initial capitalization amount |  |  | ₱ 3,000
Number of shares issued, paid |  |  | ₱ 360
Cumulative dividends annual rate |  |  | 13.50%
Series of HH 10% Cumulative Convertible Preferred Stock [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Cumulative dividends annual rate | 10.00% | 10.00% |

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