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Components of Other Comprehensive Loss - Summary of Changes in Other Comprehensive Loss (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | ₱ 116,290 | ₱ 116,666 |
Other comprehensive income (loss) | (4,290) | (6,182) | ₱ (1,407)
Ending balance | 119,665 | 116,290 | 116,666
Foreign currency translation differences of subsidiaries [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | 722 | 695 | 583
Other comprehensive income (loss) | (21) | 27 | 112
Ending balance | 701 | 722 | 695
Foreign currency translation differences of subsidiaries [Member] | Restated [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | 583
Fair value changes of financial instrument at FVOCI [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | (9) | (9) | 4,300
Ending balance | (9) | (9) | (9)
Fair value changes of financial instrument at FVOCI [Member] | Adoption of IFRS 9 [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (4,309)
Fair value changes of financial instrument at FVOCI [Member] | Restated [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (9)
Net transactions on cash flow hedges - net of tax [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | (896) | (640) | (369)
Other comprehensive income (loss) | (306) | (256) | (271)
Ending balance | (1,202) | (896) | (640)
Net transactions on cash flow hedges - net of tax [Member] | Restated [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (369)
Revaluation increment on investment properties - net of tax [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | 616 | 618 | 620
Other comprehensive income (loss) |  | (2) | (2)
Ending balance | 616 | 616 | 618
Revaluation increment on investment properties - net of tax [Member] | Restated [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | 620
Actuarial losses on defined benefit plans - net of tax [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | (31,763) | (25,689) | (24,467)
Other comprehensive income (loss) | (3,957) | (6,074) | (1,222)
Ending balance | (35,720) | (31,763) | (25,689)
Actuarial losses on defined benefit plans - net of tax [Member] | Restated [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (24,467)
Share of other comprehensive loss of associates and joint ventures accounted for using the equity method [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | 182
Other comprehensive income (loss) | (37) |  |
Ending balance | (37) |  |
Share of other comprehensive loss of associates and joint ventures accounted for using the equity method [Member] | Adoption of IFRS 9 [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (182)
Fair value changes of financial instrument at FVOCI [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | (38) | (165) |
Other comprehensive income (loss) | 37 | 127 | (29)
Ending balance | (1) | (38) | (165)
Fair value changes of financial instrument at FVOCI [Member] | Adoption of IFRS 9 [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (136)
Fair value changes of financial instrument at FVOCI [Member] | Restated [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (136)
Total other comprehensive loss attributable to equity holders of PLDT [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | (31,368) | (25,190) | (19,151)
Other comprehensive income (loss) | (4,284) | (6,178) | (1,412)
Ending balance | (35,652) | (31,368) | (25,190)
Total other comprehensive loss attributable to equity holders of PLDT [Member] | Adoption of IFRS 9 [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (4,627)
Total other comprehensive loss attributable to equity holders of PLDT [Member] | Restated [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (23,778)
Share of noncontrolling interests [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | 15 | 19 | 14
Other comprehensive income (loss) | (6) | (4) | 5
Ending balance | 9 | 15 | 19
Share of noncontrolling interests [Member] | Restated [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | 14
Aoci Including Portion Attributable To Noncontrolling Interest [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance | (31,353) | (25,171) | (19,137)
Other comprehensive income (loss) | (4,290) | (6,182) | (1,407)
Ending balance | ₱ (35,643) | ₱ (31,353) | (25,171)
Aoci Including Portion Attributable To Noncontrolling Interest [Member] | Adoption of IFRS 9 [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | (4,627)
Aoci Including Portion Attributable To Noncontrolling Interest [Member] | Restated [Member] |  |  |
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items] |  |  |
Beginning balance |  |  | ₱ (23,764)

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