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Equity - Summary of Number of Shares of Subscribed and Outstanding Capital Stock (Detail) - shares shares in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 05, 2012
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Non-voting Serial Preferred Stock [Member] |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Authorized |  | 388.0 | 388.0 | 807.5
Subscribed | [1] | 300.0 | 300.0 |
Outstanding | [1] | 300.0 | 300.0 |
Voting Preferred Stock [Member] |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Authorized |  | 150.0 | 150.0 | 150.0
Subscribed |  | 150.0 | 150.0 |
Outstanding |  | 150.0 | 150.0 |
Common Stock [Member] |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Authorized |  | 234.0 | 234.0 |
Subscribed |  | 219.0 | 219.0 |
Outstanding |  | 216.0 | 216.0 |
Treasury stock [Member] |  |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |  |
Outstanding |  | 3.0 | 3.0 |
[1] | Includes 300 million shares of Series IV Cumulative Non-Convertible Redeemable Preferred Stock subscribed for Php3 billion, of which Php360 million has been paid.

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