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Summary of Significant Accounting Policies - Reconciliation of Carrying Amounts of Financial Instruments from Their Previous Classification and Measurement Category (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Financial Assets |  |  |  |  |
Cash and cash equivalents (Note 15) | ₱ 51,654 |  | ₱ 32,905 | ₱ 38,722 | ₱ 46,455
Short-term investments | 45,672 |  | 26,554 |  |
Trade and other receivables | 40,559 |  | 48,262 |  |
Current portion of investment in debt securities and other long-term investments (Note 12) |  |  | 100 |  |
Current portion of advances and other noncurrent assets |  |  | 6,824 |  |
Less: To Financial instruments at FVPL | 4,763 |  |  |  |
Financial assets at fair value through other comprehensive income – net of current portion (Notes 6 and 24) | 2,749 |  |  |  |
Advances and other noncurrent assets – net of current portion |  |  | 13,855 |  |
Less: To Financial instruments at FVOCI | 2,749 |  |  |  |
Investment in debt securities and other long-term investments – net of current portion (Note 12) | 150 |  | 150 |  |
Total assets | 95,747 |  | 104,220 |  |
Current portion of derivative financial assets (Note 27) | 183 |  | 171 |  |
Current portion of derivative financial liabilities (Note 27) | 80 |  | 141 |  |
Less: To financial assets at FVPL | 4,763 |  |  |  |
Available-for-sale financial investments (Notes 6 and 11) |  |  | 15,165 |  |
Current portion of financial assets at fair value through other comprehensive income (Notes 6 and 24) | 1,604 |  |  |  |
Derivative financial assets – net of current portion (Note 27) | 140 |  | 215 |  |
IAS 39 [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Total assets |  | ₱ 88,519 |  |  |
Available-for-sale financial investments (Notes 6 and 11) |  | 15,165 |  |  |
Financial assets available for sale |  | 15,165 |  |  |
IAS 39 [Member] | Derivatives Used For Hedging Category |  |  |  |  |
Financial Assets |  |  |  |  |
Current portion of derivative financial assets (Note 27) |  | 171 |  |  |
Derivative financial assets – net of current portion |  | 215 |  |  |
Current portion of derivative financial liabilities (Note 27) |  | (51) |  |  |
Derivative financial liabilities – net of current portion |  | (8) |  |  |
Derivative financial assets held for hedging |  | 327 |  |  |
Reclassification [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Trade and other receivables |  | 4,091 |  |  |
Current portion of advances and other noncurrent assets |  | (6,785) |  |  |
Less: To Financial instruments at FVPL |  | (15,165) |  |  |
Advances and other noncurrent assets – net of current portion |  | 11,461 |  |  |
Less: To Financial instruments at FVOCI |  | (11,461) |  |  |
Investment in debt securities and other long-term investments – net of current portion (Note 12) |  | 150 |  |  |
Loans receivables |  | 15,552 |  |  |
Total assets |  | (22,187) |  |  |
Less: To Financial instruments at amortized cost |  | (150) |  |  |
Current portion of derivative financial assets (Note 27) |  | (171) |  |  |
Derivative financial assets – net of current portion |  | (215) |  |  |
Current portion of derivative financial liabilities (Note 27) |  | 51 |  |  |
Derivative financial liabilities – net of current portion |  | 8 |  |  |
Derivative financial assets held for hedging |  | (327) |  |  |
Available-for-sale financial investments (Notes 6 and 11) |  | (15,165) |  |  |
Financial assets available for sale |  | (15,165) |  |  |
Current portion of financial assets at fair value through other comprehensive income (Notes 6 and 24) |  | 15,552 |  |  |
Derivative financial assets – net of current portion (Note 27) |  | 22,277 |  |  |
Reclassification [Member] | Derivatives Used For Hedging Category |  |  |  |  |
Financial Assets |  |  |  |  |
Current portion of derivative financial assets (Note 27) |  | (171) |  |  |
Derivative financial assets – net of current portion |  | (215) |  |  |
Current portion of derivative financial liabilities (Note 27) |  | 51 |  |  |
Derivative financial liabilities – net of current portion |  | 8 |  |  |
Less: To financial assets at FVPL |  | (327) |  |  |
Derivative financial assets held for hedging |  | (327) |  |  |
Remeasurement [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Trade and other receivables |  | (8) |  |  |
Advances and other noncurrent assets – net of current portion |  | (128) |  |  |
Total assets |  | (136) |  |  |
Current portion of financial assets at fair value through other comprehensive income (Notes 6 and 24) |  | (136) |  |  |
Remeasurement [Member] | ECL [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Total assets |  | (276) |  |  |
Loans and receivables, category [member] |  |  |  |  |
Financial Assets |  |  |  |  |
Cash and cash equivalents (Note 15) |  |  | 32,905 |  |
Current portion of investment in debt securities and other long-term investments (Note 12) |  |  | 100 |  |
Current portion of advances and other noncurrent assets |  |  | 6,824 |  |
Advances and other noncurrent assets – net of current portion |  |  | 13,855 |  |
Total assets |  |  | 88,519 |  |
Loans and receivables, category [member] | IAS 39 [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Cash and cash equivalents (Note 15) |  | 32,905 |  |  |
Short-term investments |  | 1,074 |  |  |
Trade and other receivables |  | 33,761 |  |  |
Current portion of investment in debt securities and other long-term investments (Note 12) |  | 100 |  |  |
Current portion of advances and other noncurrent assets |  | 6,824 |  |  |
Advances and other noncurrent assets – net of current portion |  | 13,855 |  |  |
Loans and receivables, category [member] | Reclassification [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Trade and other receivables |  | (4,091) |  |  |
Current portion of advances and other noncurrent assets |  | (6,785) |  |  |
Less: To Financial instruments at FVPL |  | (6,785) |  |  |
Financial assets at fair value through other comprehensive income – net of current portion (Notes 6 and 24) |  | (4,091) |  |  |
Advances and other noncurrent assets – net of current portion |  | (11,461) |  |  |
Loans and receivables, category [member] | Remeasurement [Member] | ECL [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Trade and other receivables |  | (258) |  |  |
Advances and other noncurrent assets – net of current portion |  | (18) |  |  |
HTM investments [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Investment in debt securities and other long-term investments – net of current portion (Note 12) |  |  | 150 |  |
Total assets |  |  | 150 |  |
HTM investments [Member] | IAS 39 [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Investment in debt securities and other long-term investments – net of current portion (Note 12) |  | 150 |  |  |
Current held-to-maturity investments |  | 150 |  |  |
HTM investments [Member] | Reclassification [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Investment in debt securities and other long-term investments – net of current portion (Note 12) |  | (150) |  |  |
Loans receivables |  | 150 |  |  |
Current held-to-maturity investments |  | (150) |  |  |
Available-for-sale financial investments [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Total assets |  |  | 15,165 |  |
Available-for-sale financial investments (Notes 6 and 11) |  |  | 15,165 |  |
Available-for-sale financial investments [Member] | Reclassification [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Loans receivables |  | (6,785) |  |  |
Available-for-sale financial investments (Notes 6 and 11) |  | (15,165) |  |  |
Financial Instruments At Amortized Cost | IFRS 9 [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Cash and cash equivalents (Note 15) |  | 32,905 |  |  |
Short-term investments |  | 1,074 |  |  |
Trade and other receivables |  | 29,412 |  |  |
Current portion of investment in debt securities and other long-term investments (Note 12) |  | 100 |  |  |
Current portion of advances and other noncurrent assets |  | 39 |  |  |
Advances and other noncurrent assets – net of current portion |  | 2,376 |  |  |
Investment in debt securities and other long-term investments – net of current portion (Note 12) |  | 150 |  |  |
Loans receivables |  | 66,056 |  |  |
Financial assets at fair value through other comprehensive income, category [member] |  |  |  |  |
Financial Assets |  |  |  |  |
Less: To Financial instruments at FVOCI | 2,749 |  |  |  |
Total assets | 4,353 |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] | IFRS 9 [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Trade and other receivables |  | 4,083 |  |  |
Advances and other noncurrent assets – net of current portion |  | 11,333 |  |  |
Current portion of financial assets at fair value through other comprehensive income (Notes 6 and 24) |  | 15,416 |  |  |
Financial assets at fair value through profit or loss, category [member] |  |  |  |  |
Financial Assets |  |  |  |  |
Less: To Financial instruments at FVPL | 4,763 |  |  |  |
Total assets | 11,919 |  |  |  |
Current portion of derivative financial assets (Note 27) | 183 |  |  |  |
Current portion of derivative financial liabilities (Note 27) | 80 |  | ₱ 90 |  |
Derivative financial assets – net of current portion (Note 27) | ₱ 140 |  |  |  |
Financial assets at fair value through profit or loss, category [member] | IFRS 9 [Member] |  |  |  |  |
Financial Assets |  |  |  |  |
Current portion of advances and other noncurrent assets |  | 6,785 |  |  |
Current portion of derivative financial assets (Note 27) |  | 171 |  |  |
Derivative financial assets – net of current portion |  | 215 |  |  |
Current portion of derivative financial liabilities (Note 27) |  | (51) |  |  |
Derivative financial liabilities – net of current portion |  | (8) |  |  |
Available-for-sale financial investments (Notes 6 and 11) |  | 15,165 |  |  |
Derivative financial assets – net of current portion (Note 27) |  | ₱ 22,277 |  |  |

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_a&doctype=Standard -URIDate 2018-03-16 + Details
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