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Pension and Other Employee Benefits - Summary of Shares of Stocks of Defined Benefit Pension Plans (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Shares of stocks | ₱ 2,316 | ₱ 1,903
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 | 1,401 | 1,026
Parent [Member] | Common Stock [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Shares of stocks | 48 | 35
Others [Member] | Common Stock [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Shares of stocks | ₱ 507 | ₱ 482

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