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Financial Assets And Liabilities - Summary of Effect of the Cash Flow Hedge in Consolidated Income Statements and Statements of Other Comprehensive Income (Detail) - Cash Flow Hedges Member [Member] - PHP (₱) ₱ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Foreign currency exchange risk [Member]
Disclosure Of Hedge Accounting [Line Items]
Total hedging loss recognized in OCI	₱ (764)
Foreign currency exchange risk [Member] | Long Term Currency Swaps
Disclosure Of Hedge Accounting [Line Items]
Total hedging loss recognized in OCI	₱ (350)	₱ (366)
Line item in our Consolidated Income Statements	Other comprehensive loss	Other comprehensive loss
Foreign currency exchange risk [Member] | Long-term Foreign Currency Options [Member]
Disclosure Of Hedge Accounting [Line Items]
Total hedging loss recognized in OCI	₱ (414)
Line item in our Consolidated Income Statements	Other comprehensive loss
Interest rate risk [member] | Interest Rate Swap1
Disclosure Of Hedge Accounting [Line Items]
Total hedging loss recognized in OCI	₱ (24)	₱ (68)
Line item in our Consolidated Income Statements	Other comprehensive loss	Other comprehensive loss

X

- Definition

The description of the line item in the statement of comprehensive income that includes the recognised hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 24C
-Subparagraph a
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24C_a_ii&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 24C
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24C_b_iii&doctype=Standard
-URIDate 2020-01-01

+ Details

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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 24C
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24C_a_i&doctype=Standard
-URIDate 2020-01-01

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- Details

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