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Financial Assets and Liabilities - Additional Information (Detail) |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2019 PHP (₱) | Mar. 20, 2019 USD ($) | Aug. 02, 2016 | Aug. 05, 2014 | Dec. 31, 2018 PHP (₱) | Dec. 31, 2018 PHP (₱) | Dec. 31, 2018 PHP (₱) | Dec. 31, 2018 PHP (₱) USD ($) | Dec. 31, 2017 PHP (₱) | Dec. 31, 2017 PHP (₱) | Dec. 31, 2017 PHP (₱) USD ($) | Dec. 31, 2016 PHP (₱) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 PHP (₱)
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments subject to enforceable master netting arrangement |  |  |  |  | ₱ 0 | ₱ 0 | ₱ 0 | ₱ 0 | ₱ 0 | ₱ 0 | ₱ 0 |  |  |  |
Transfers into of Level 3 of fair value hierarchy, investment properties |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |
Transfers out of Level 3 of fair value hierarchy, investment properties |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |
Financial liabilities fair value transfer into Level 3 |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |
Financial liabilities fair value transfer out of Level 3 |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |
Transfer of financial assets fair value from Level 1 to Level 2 |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |
Transfer of financial assets fair value from Level 2 to Level 1 |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |
Transfer of financial liabilities fair value from Level 1 to Level 2 |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |
Transfer of financial liabilities fair value from Level 2 to Level 1 |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 51,654,000,000 | 51,654,000,000 | 51,654,000,000 | 51,654,000,000 | 32,905,000,000 | 32,905,000,000 | 32,905,000,000 | ₱ 38,722,000,000 |  |  | ₱ 46,455,000,000
Short-term investments |  |  |  |  | ₱ 1,165,000,000 | 1,165,000,000 | ₱ 1,165,000,000 | ₱ 1,165,000,000 | 1,074,000,000 | ₱ 1,074,000,000 | ₱ 1,074,000,000 |  |  |  |
Exchange rate |  |  |  |  |  |  | 52.56 |  |  |  |  |  |  |  |
Increase in consolidated foreign currency-denominated financial liabilities |  |  |  |  |  | 9,000,000 |  |  |  |  |  |  |  |  |
Foreign exchange losses |  |  |  |  |  | 771,000,000 |  |  | 411,000,000 |  |  | ₱ 2,785,000,000 |  |  |
Percentage of decrease or decrease in value of currency |  |  |  |  |  |  | 1.21% |  |  |  |  |  |  |  |
Weighted Average Foreign Exchange Rate |  |  |  |  |  |  | 52.56 |  |  |  |  |  |  |  |
Foreign exchange gain (loss ) after tax |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |
Net foreign exchange gain /loss |  |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |
Decrease in consolidated variable rate debt |  |  |  |  |  | ₱ 36,575,000,000 |  |  | ₱ 40,353,000,000 |  |  |  |  |  |
Decrease in dividend payout |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |
Floating interest rate [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated debts with variable rates |  |  |  |  | 21.00% | 21.00% | 21.00% | 21.00% | 23.00% | 23.00% | 23.00% |  | 21.00% | 23.00% |
Fixed interest rate [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated debts with fixed rate |  |  |  |  | 89.00% | 89.00% | 89.00% | 89.00% | 92.00% | 92.00% | 92.00% |  | 89.00% | 92.00% |
Foreign currency exchange risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate |  |  |  |  |  | 52.56 | 52.56 | 1.00 | 49.96 | 49.96 | 1.00 |  |  |  |
Percentage of consolidated debts |  |  |  |  |  |  | 13.00% |  |  | 20.00% |  |  |  |  |
Decrease in consolidated foreign currency-denominated debt |  |  |  |  | ₱ 23,352,000,000 | ₱ 23,352,000,000 | ₱ 23,352,000,000 | ₱ 23,352,000,000 | ₱ 35,032,000,000 | ₱ 35,032,000,000 | ₱ 35,032,000,000 |  |  |  |
Percentage of consolidated debts unhedged |  |  |  |  | 12.00% | 12.00% | 12.00% | 12.00% | 16.00% | 16.00% | 16.00% |  | 12.00% | 16.00% |
Percentage of consolidated debts unhedged net of cash allocated for debt |  |  |  |  | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% |  | 8.00% | 8.00% |
Percentage of consolidated revenues denominated in U.S. dollars |  |  |  |  | 16.00% | 16.00% | 16.00% | 16.00% | 16.00% | 16.00% | 16.00% |  | 16.00% | 16.00% |
Percentage of consolidated expenses denominated in U.S. dollars |  |  |  |  | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% | 8.00% |  | 8.00% | 8.00% |
Reduction in value of currency |  |  |  |  | 5.20% | 5.20% | 5.20% | 5.20% |  |  |  |  | 5.20% |  |
Weighted Average Foreign Exchange Rate |  |  |  |  |  | 52.56 | 52.56 | 1.00 | 49.96 | 49.96 | 1.00 |  |  |  |
Currency Swap Contract [Member] | Foreign currency exchange risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term principal only currency swap | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,000,000 | $ 90,000,000 |
Interest rate swap contract [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term principal only currency swap |  |  |  |  | ₱ 323,000,000 | ₱ 323,000,000 | ₱ 323,000,000 | ₱ 323,000,000 | ₱ 525,000,000 | ₱ 525,000,000 | ₱ 525,000,000 |  |  |  |
Events After Reporting Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate | 52.89 | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Foreign Exchange Rate | 52.89 | 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Bottom Of Range [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Pay Out Rate |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Pay Out Rate |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |
Operating lease obligations [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease contracts for periods |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Operating lease obligations [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease contracts for periods |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Other obligations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Various Trade and Other Obligations |  |  |  |  | ₱ 145,892,000,000 | 145,892,000,000 | 145,892,000,000 | 145,892,000,000 | 128,618,000,000 | 128,618,000,000 | 128,618,000,000 |  |  |  |
Letters of credit [Member] | Within 12 months [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding consolidated commercial commitments |  |  |  |  | ₱ 20,000,000 | 20,000,000 | ₱ 20,000,000 | ₱ 20,000,000 | ₱ 88,000,000 | ₱ 88,000,000 | ₱ 88,000,000 |  |  |  |
Foreign currency exchange risk [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 45 |  |  |  |  |  |  |  |  |  |
Percentage of exchange rate weaken/strengthen |  |  |  |  |  |  | 55.00% |  |  |  |  |  |  |  |
Foreign currency exchange risk [Member] | U.S. Dollars [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net foreign exchange gain /loss |  |  |  |  |  | 39,000,000 |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 45 |  |  |  |  |  |  |  |  |  |
Increase decrease in profit after tax |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |
Foreign currency exchange risk [Member] | Philippine Peso [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net foreign exchange gain /loss |  |  |  |  |  | 8,000 |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 55 |  |  |  |  |  |  |  |  |  |
Increase decrease in profit after tax |  |  |  |  |  | ₱ 13,000,000 |  |  |  |  |  |  |  |  |

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- Definition The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial instruments subject to an enforceable master netting arrangement or similar agreement that are not set off against financial liabilities. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph IG40D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_IG40D&doctype=Implementation%20Guidance -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 13C -Subparagraph d -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_13C_d_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, net of tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_a&doctype=Standard -URIDate 2018-03-16 + Details
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