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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items]      
Beginning balance ₱ 116,666 ₱ 111,183 ₱ 108,537
Other comprehensive income (loss) (6,182) (1,407) 2,186
Ending balance 116,290 116,666 111,183
Foreign currency translation differences of subsidiaries [Member]      
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items]      
Beginning balance 695 583 608
Other comprehensive income (loss) 27 112 (25)
Ending balance 722 695 583
Foreign currency translation differences of subsidiaries [Member] | Restated [Member]      
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items]      
Beginning balance   583  
Ending 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) 4,300 936
Other comprehensive income (loss)     3,364
Ending balance (9) (9) 4,300
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)  
Ending 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)  
Ending 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 (640) (369) 7
Other comprehensive income (loss) (256) (271) (376)
Ending balance (896) (640) (369)
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)  
Ending balance     (369)
Revaluation increment on investment properties - net of tax [Member]      
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items]      
Beginning balance 618 620 619
Other comprehensive income (loss) (2) (2) 1
Ending balance 616 618 620
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  
Ending 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 (25,689) (24,467) (23,376)
Other comprehensive income (loss) (6,074) (1,222) (1,091)
Ending balance (31,763) (25,689) (24,467)
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)  
Ending balance     (24,467)
Share of other comprehensive income (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   182 312
Other comprehensive income (loss)     306
Recycled to retained earnings     (436)
Ending balance     182
Share of other comprehensive income (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)  
Ending balance     (182)
Fair value changes of financial instrument at FVOCI [Member]      
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items]      
Beginning balance (165)    
Other comprehensive income (loss) 127 (29)  
Ending balance (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)  
Ending 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)  
Ending 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 (25,190) (19,151) (20,894)
Other comprehensive income (loss) (6,178) (1,412) 2,179
Recycled to retained earnings     (436)
Ending balance (31,368) (25,190) (19,151)
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)  
Ending 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)  
Ending balance     (23,778)
Share of noncontrolling interests [Member]      
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items]      
Beginning balance 19 14 7
Other comprehensive income (loss) (4) 5 7
Ending balance 15 19 14
Share of noncontrolling interests [Member] | Restated [Member]      
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items]      
Beginning balance   14  
Ending balance     14
Aoci Including Portion Attributable To Noncontrolling Interest [Member]      
Disclosure Of Analysis Of Other Comprehensive Income By Item [Line Items]      
Beginning balance (25,171) (19,137) (20,887)
Other comprehensive income (loss) (6,182) (1,407) 2,186
Recycled to retained earnings     (436)
Ending balance ₱ (31,353) (25,171) (19,137)
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)  
Ending 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)  
Ending balance     ₱ (23,764)