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Income Taxes - Additional Information (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended 36 Months Ended
Jul. 01, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2023
Disclosure Of Other Income Expense [Line Items]            
Excess MCIT deducted against RCIT     ₱ 1,426 ₱ 206 ₱ 488  
Consolidated unrecognized deferred income tax assets     1,940 2,294    
Total excess MCIT     23      
Expired portion of excess MCIT     1 10 1  
Total NOLCO claimed as deduction against future taxable income     1,670      
Deduction against taxable income     2,109 9,530 1,094  
Expired portion of excess NOLCO     1,170 973 1,272  
Expiration amount of NOLCO incurred after five years     ₱ 188      
Applicable tax rate     30.00%      
Net taxable income     ₱ 9,906 9,701 ₱ 6,845  
Bottom of range [member] | CREATE Bill [Member]            
Disclosure Of Other Income Expense [Line Items]            
Lower MCIT rate           1.00%
Top of range [member] | CREATE Bill [Member]            
Disclosure Of Other Income Expense [Line Items]            
Lower MCIT rate           2.00%
Domestic and Foreign Corporations [Member]            
Disclosure Of Other Income Expense [Line Items]            
Applicable tax rate 25.00% 30.00%        
Small and Medium Domestic Corporations [Member]            
Disclosure Of Other Income Expense [Line Items]            
Lower income tax rate     20.00%      
Net taxable income     ₱ 5      
Small and Medium Domestic Corporations [Member] | Bottom of range [member]            
Disclosure Of Other Income Expense [Line Items]            
Net taxable income for assets excluding land     100      
DMPI and ePLDT [Member]            
Disclosure Of Other Income Expense [Line Items]            
Consolidated unrecognized deferred income tax assets     209 ₱ 1,988    
VIH [Member]            
Disclosure Of Other Income Expense [Line Items]            
Unrecognized deferred income tax liability     ₱ 234      
Subic Tel and Clark Tel [Member]            
Disclosure Of Other Income Expense [Line Items]            
Special income tax rate as percentage of gross sales     5.00%