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Income Taxes - Summary of Analysis of Net Deferred Income Tax Liabilities (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Deferred income tax liabilities | ₱ (169) | ₱ (726) | ₱ (2,583)
Costs [Member] | After 12 months [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Deferred income tax liabilities | (173) | (477) |
Costs [Member] | Less than 1 year [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Deferred income tax liabilities | ₱ 4 | ₱ (249) |

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