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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Mar. 01, 2021
Apr. 30, 2020
PHP (₱)
Payment
Nov. 07, 2019
PHP (₱)
Aug. 07, 2018
PHP (₱)
Mar. 05, 2018
PHP (₱)
Jun. 13, 2017
PHP (₱)
May 30, 2016
PHP (₱)
Jun. 30, 2012
PHP (₱)
Mar. 24, 2000
Dec. 31, 2020
PHP (₱)
Dec. 31, 2018
Dec. 31, 2011
PHP (₱)
Apr. 27, 2020
PHP (₱)
Jan. 23, 2020
PHP (₱)
Dec. 31, 2019
PHP (₱)
Sep. 13, 2019
PHP (₱)
Aug. 15, 2019
PHP (₱)
Oct. 26, 2011
Disclosure Of Significant Accounting Policies [Line Items]                                    
Consideration paid (received)           ₱ 21,800,000,000 ₱ 26,200,000,000                      
Total consideration transferred             ₱ 52,800,000,000                      
Total expenses related to Covid-19 measures                   ₱ 903,000,000                
Rent concessions as effect of Covid-19 pandemic                   137,000,000                
ECL recognized on investment                   ₱ 0                
Description of debt investment security credit risk                   debt instruments to have low credit risk when its credit risk rating is equivalent to the globally understood definition of ‘investment grade’, or when the exposure is less than 30 days past due.                
Transaction price allocated to remaining performance obligations                   ₱ 22,921,000,000         ₱ 22,864,000,000      
Equivalency of each Giga Point                   ₱ 1.00                
Less than 1 year [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Remaining performance obligations percentage                   72.00%         68.00%      
1-2 years [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Remaining performance obligations percentage                   28.00%         32.00%      
Events after Reporting Period [Member] | PHW Subscribers [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Notice period to subscribers 30 days                                  
Initial purchase price                   ₱ 1,455,000,000                
Sun Trademark [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Amortization                   1,877,000,000                
Digital Telecommunications Phils., Inc. [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Acquisition                       ₱ 4,505,000,000            
PLDT Home, Smart Consumer Postpaid, and Sun Consumer Postpaid Subscribers [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Equal monthly payments | Payment   6                                
Interest   0.00%                                
Penalties   ₱ 0                                
Digital Telecommunications Phils., Inc. [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Percentage of ownership interest in subsidiary acquired                                   51.60%
Smart Communications, Inc. [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Percentage of Ownership                 100.00%                  
Amount paid to minority shareholders                   6,825,000,000                
Smart Communications, Inc. [Member] | Red Mobile [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Consideration paid (received)               ₱ 18,000,000                    
Connectivity Unlimited Resource Enterprise | Ph Communications Holdings Corporation                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Percentage of Ownership                     97.00%              
Connectivity Unlimited Resource Enterprise | Francom Holdings Inc                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Percentage of Ownership                     3.00%              
Primeworld Digital Systems, Inc. [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Percentage of ownership interest in subsidiary acquired     5.00%                              
Consideration paid (received)     ₱ 20,000,000                              
Percentage of Ownership     100.00% 95.00% 67.00%                          
Additional Investments       ₱ 66,000,000 ₱ 134,000,000                          
PLDT Communications and Energy Ventures, Inc. [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Amount paid to minority shareholders                   ₱ 4,000,000                
Philcom [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Total consideration transferred                               ₱ 319,000,000 ₱ 1,760,000,000  
SubicTel [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Total consideration transferred                           ₱ 622,000,000        
Maratel Subscribers [Member]                                    
Disclosure Of Significant Accounting Policies [Line Items]                                    
Total consideration transferred                         ₱ 500,000,000