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Pension and Other Employee Benefits - Summary of Unlisted Equity Investments of Defined Benefit Pension Plans (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Unlisted Equity Investments | ₱ 52,123 | ₱ 53,863 | ₱ 55,427
MediaQuest PDRs [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
% of Ownership | 100.00% | 100.00% |
Unlisted Equity Investments | ₱ 9,955 | ₱ 10,050 |
Tahanan Mutual Building and Loan Association, Inc [member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
% of Ownership | 100.00% | 100.00% |
Unlisted Equity Investments | ₱ 542 | ₱ 544 |
BTF Holdings, Inc. [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
% of Ownership | 100.00% | 100.00% |
Unlisted Equity Investments | ₱ 231 | ₱ 221 |
Unquoted equity investments [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Unlisted Equity Investments | ₱ 10,728 | ₱ 10,815 |

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_24_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_e&doctype=Standard -URIDate 2020-01-01 + Details
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