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Financial Assets and Liabilities - Summary of Impact of Hedging Instruments (Detail) ₱ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 PHP (₱) USD ($) | Dec. 31, 2019 PHP (₱) USD ($)
Foreign currency exchange risk [Member] |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Notional Amount | $ | 224 | 36
Carrying Amount | ₱ (404) | ₱ (45)
Foreign currency exchange risk [Member] | Derivative Financial Liabilities Net Of Current Portion |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Carrying Amount | ₱ (14) | ₱ (25)
Line item in our Consolidated Statements of Financial Position | Derivative financial liabilities – net of current portion | Derivative financial liabilities – net of current portion
Foreign currency exchange risk [Member] | Current Portion of Derivative Financial Liabilities [Member] |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Carrying Amount | ₱ (48) | ₱ (24)
Line item in our Consolidated Statements of Financial Position | Current portion of derivative financial liabilities | Current portion of derivative financial liabilities
Foreign currency exchange risk [Member] | Long-term Foreign Currency Options [Member] |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Notional Amount | $ | 200 |
Carrying Amount | ₱ (342) |
Line item in our Consolidated Statements of Financial Position | Derivative financial liabilities – net of current portion |
Foreign currency exchange risk [Member] | Current Portion Of Derivative Financial Assets |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Carrying Amount |  | ₱ 3
Line item in our Consolidated Statements of Financial Position |  | Current portion of derivative financial assets
Foreign currency exchange risk [Member] | Long Term Currency Swaps |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Notional Amount | $ | 24 | 36
Carrying Amount |  | ₱ 1
Line item in our Consolidated Statements of Financial Position | Derivative financial assets – net of current portion | Derivative financial assets – net of current portion
Interest rate risk [member] |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Notional Amount | $ | 40,000,000 | 233,000,000
Carrying Amount | ₱ (26) |
Interest rate risk [member] | Derivative Financial Liabilities Net Of Current Portion |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Carrying Amount | ₱ (4) | ₱ (1)
Line item in our Consolidated Statements of Financial Position | Derivative financial liabilities – net of current portion | Derivative financial liabilities – net of current portion
Interest rate risk [member] | Current Portion of Derivative Financial Liabilities [Member] |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Carrying Amount | ₱ (44) | ₱ (31)
Line item in our Consolidated Statements of Financial Position | Current portion of derivative financial liabilities | Current portion of derivative financial liabilities
Interest rate risk [member] | Current Portion Of Derivative Financial Assets |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Carrying Amount | ₱ 22 | ₱ 31
Line item in our Consolidated Statements of Financial Position | Current portion of derivative financial assets | Current portion of derivative financial assets
Interest rate risk [member] | Interest Rate Swap1 |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Notional Amount | $ | 40,000,000 | 233,000,000
Carrying Amount |  | ₱ 1
Line item in our Consolidated Statements of Financial Position | Derivative financial assets – net of current portion | Derivative financial assets – net of current portion

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- Definition The description of the line item in the statement of financial position that includes the hedged item. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24B -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24B_a_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- 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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- Definition The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 23B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24A -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Hedged financial instruments carrying amount. + References No definition available. + Details
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