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Employee Benefits - Summary of Shares of Stocks of Defined Benefit Pension Plans (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Shares of stocks | ₱ 2,066 | ₱ 2,510
Preferred stock [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Shares of stocks | 360 | 360
PSE [member] | Common Stock [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Shares of stocks | 1,185 | 1,555
Parent [Member] | Common Stock [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Shares of stocks | 30 | 39
Others [Member] | Common Stock [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Shares of stocks | ₱ 491 | ₱ 556

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