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Summary of Material Accounting Policies - Additional Information (Detail)
$ in Millions
 12 Months Ended
Sep. 30, 2024
PHP (₱)
Sep. 27, 2024
PHP (₱)
shares
May 06, 2024
PHP (₱)
shares
Apr. 30, 2024
PHP (₱)
shares
Apr. 05, 2024
PHP (₱)
shares
Apr. 05, 2024
USD ($)
shares
Jan. 12, 2024
Jan. 05, 2024
PHP (₱)
shares
Dec. 13, 2023
PHP (₱)
shares
Dec. 13, 2023
USD ($)
shares
Dec. 31, 2024
PHP (₱)
Segment
Dec. 31, 2023
PHP (₱)
Dec. 31, 2022
PHP (₱)
Feb. 28, 2018
PHP (₱)
Disclosure Of Significant Accounting Policies [Line Items]                            
Amount of equity interest acquired                     ₱ 52,764,000,000 ₱ 50,308,000,000    
Carrying value of investments in joint ventures                     33,783,000,000 33,690,000,000    
ECL recognized on investment                     ₱ 0      
Description of debt investment security credit risk                     debt instrument 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.      
Carrying value of investments in associates                     ₱ 18,981,000,000 16,618,000,000   ₱ 1,664,000,000
Equity interest paid                     3,770,000,000 ₱ 1,636,000,000 ₱ 3,514,000,000  
Impairment loss                     0      
PLDT Capital [Member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Issued and paid up share capital     ₱ 891,000,000                      
Ordinary shares | shares     26,773,606                      
Issued and paid up ordinary shares     ₱ 1,000,000                      
Ordinary shares fully paid | shares     30,058                      
Smart and DMPI [Member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Consideration paid (received)                     ₱ 87,319,000,000      
PLDT Communications and Energy Ventures, Inc. [Member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Consideration paid (received)         ₱ 857,000,000 $ 15.3     ₱ 1,563,000,000 $ 28.0        
PLDT Communications and Energy Ventures, Inc. [Member] | Warrants [member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Issuance of convertible preferred shares | $           $ 152.0       $ 281.0        
Warrant received | shares         2,700,000 2,700,000     4,900,000 4,900,000        
PLDT Communications and Energy Ventures, Inc. [Member] | Bottom of range [member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Percentage of ownership                 36.63% 36.63%        
Percentage of investment in associates         36.97% 36.97%                
PLDT Communications and Energy Ventures, Inc. [Member] | Top of range [member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Percentage of ownership                 36.97% 36.97%        
Percentage of investment in associates         37.66% 37.66%                
MIH [Member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Carrying value of investments in joint ventures | $                   $ 80.0        
Shares subscribed | shares         6,700,000 6,700,000     12,300,000 12,300,000        
PLDT and Subsidiaries [Member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Number of business segments | Segment                     3      
Multisys [Member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Number of common stock shares sold | shares               227            
Percentage of ownership             45.73%              
Percentage of equity interest               4.99%            
Amendment agreement description                     PGIH retained ownership of 2,080 common shares representing 45.73% equity interest in Multisys. Pursuant to the Restated Shareholders’ and related Amendment Agreement signed on January 30, 2024 and March 1, 2024, respectively, PGIH remains entitled to nominate three out of the five directors in Multisys, who manage and control the operations of Multisys. Consequently, the results of operation and financial position of Multisys continue to be consolidated with the PLDT Group.      
Equity interest paid               ₱ 270,000,000            
Number of common shares ownership retained | shares               2,080            
Kayana [Member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Shares subscribed | shares   840,000,000                        
Percentage of equity interest 45.00% 60.00%                        
Carrying value of investments in associates                     ₱ 886,500,000      
Equity interest paid ₱ 46,500,000 ₱ 840,000,000                        
Subscription Payable   ₱ 288,000,000                 10,500,000      
Subscription Payable With Carrying Value                     ₱ 853,000,000      
Kayana [Member] | Remaining Shareholders [Member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Equity interest paid ₱ 523,500,000                          
Radius Telecom, Inc. [Member]                            
Disclosure Of Significant Accounting Policies [Line Items]                            
Percentage of investment in associates       34.90%                    
Shares subscribed | shares       2,491,516                    
Equity interest paid       ₱ 2,000,000,000