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Financial Assets and Liabilities - Summary of Movements of Consolidated Mark-to-Market Gains (Losses) (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes In Fair Value Of Credit Derivative [Abstract] |  |  |
Net mark-to-market gains at beginning of the year | ₱ 237 | ₱ 514 |
Gains on derivative financial instruments (Note 4) | 1,135 | 724 | ₱ 1,539
Effective portion recognized in the profit or loss for the cash flow hedges | 27 | (55) |
Net fair value gains (losses) on cash flow hedges (Note 27) | (286) | (411) | 76
Settlements, interest expense and others | (870) | (535) |
Net mark-to-market gains at end of the year | ₱ 243 | ₱ 237 | ₱ 514

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- Definition The amount of other comprehensive income, before tax, related to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income, before tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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