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Equity - Summary of Dividends Declared (Detail) - PHP (₱)
₱ / shares in Units, ₱ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Dividends [Line Items]                                
Total Amount ₱ 10,167                         ₱ 20,800 ₱ 23,393 ₱ 25,338
Series IV Cumulative Non-Convertible Redeemable Preferred Stock [Member]                                
Disclosure Of Dividends [Line Items]                                
Approved Date   Nov. 12, 2024 Aug. 13, 2024 May 09, 2024 Jan. 30, 2024 Nov. 07, 2023 Aug. 03, 2023 May 04, 2023 Jan. 31, 2023 Nov. 03, 2022 Aug. 04, 2022 May 05, 2022 Jan. 25, 2022      
Record Date   Nov. 28, 2024 Aug. 28, 2024 May 24, 2024 Feb. 14, 2024 Nov. 22, 2023 Aug. 19, 2023 May 19, 2023 Feb. 27, 2023 Nov. 18, 2022 Aug. 19, 2022 May 20, 2022 Feb. 21, 2022      
Payable Date   Dec. 15, 2024 Sep. 15, 2024 Jun. 15, 2024 Mar. 15, 2024 Dec. 15, 2023 Sep. 15, 2023 Jun. 15, 2023 Mar. 15, 2023 Dec. 15, 2022 Sep. 15, 2022 Jun. 15, 2022 Mar. 15, 2022      
Total Amount   ₱ 12 ₱ 12 ₱ 13 ₱ 12 ₱ 12 ₱ 13 ₱ 12 ₱ 12 ₱ 12 ₱ 12 ₱ 13 ₱ 12 49 49 49
Series IV Cumulative Non-Convertible Redeemable Preferred Stock [Member] | Events After Reporting Period [member]                                
Disclosure Of Dividends [Line Items]                                
Approved Date Jan. 28, 2025                              
Record Date Feb. 11, 2025                              
Payable Date Mar. 15, 2025                              
Total Amount ₱ 12                              
Voting Preferred Stock [Member]                                
Disclosure Of Dividends [Line Items]                                
Approved Date   Dec. 03, 2024 Aug. 13, 2024 Jun. 11, 2024 Mar. 21, 2024 Dec. 05, 2023 Aug. 29, 2023 Jun. 13, 2023 Mar. 02, 2023 Dec. 15, 2022 Aug. 24, 2022 Jun. 14, 2022 Mar. 03, 2022      
Record Date   Dec. 17, 2024 Sep. 16, 2024 Jun. 28, 2024 Apr. 05, 2024 Dec. 22, 2023 Sep. 13, 2023 Jun. 28, 2023 Mar. 17, 2023 Dec. 29, 2022 Sep. 15, 2022 Jun. 30, 2022 Mar. 23, 2022      
Payable Date   Jan. 15, 2025 Oct. 15, 2024 Jul. 15, 2024 Apr. 15, 2024 Jan. 15, 2024 Oct. 15, 2023 Jul. 15, 2023 Apr. 15, 2023 Jan. 15, 2023 Oct. 15, 2022 Jul. 15, 2022 Apr. 15, 2022      
Total Amount   ₱ 3 ₱ 2 ₱ 3 ₱ 2 ₱ 2 ₱ 2 ₱ 3 ₱ 3 ₱ 3 ₱ 3 ₱ 2 ₱ 2 10 10 10
Common Stock [Member]                                
Disclosure Of Dividends [Line Items]                                
Approved Date       Aug. 13, 2024 Mar. 07, 2024   Mar. 23, 2023 Aug. 03, 2023 Mar. 23, 2023   Aug. 04, 2022 Aug. 04, 2022 Mar. 03, 2022      
Record Date       Aug. 27, 2024 Mar. 21, 2024   Apr. 11, 2023 Aug. 17, 2023 Apr. 11, 2023   Aug. 18, 2022 Aug. 18, 2022 Mar. 17, 2022      
Payable Date       Sep. 11, 2024 Apr. 05, 2024   Apr. 24, 2023 Sep. 04, 2023 Apr. 24, 2023   Sep. 05, 2022 Sep. 05, 2022 Apr. 04, 2022      
Per Share Amount       ₱ 50 ₱ 46   ₱ 14 ₱ 49 ₱ 45   ₱ 28 ₱ 47 ₱ 42      
Total Amount       ₱ 10,803 ₱ 9,938   ₱ 3,025 ₱ 10,587 ₱ 9,722   ₱ 6,049 ₱ 10,155 ₱ 9,075 ₱ 20,741 ₱ 23,334 ₱ 25,279
Common Stock [Member] | Events After Reporting Period [member]                                
Disclosure Of Dividends [Line Items]                                
Approved Date Feb. 27, 2025                              
Record Date Mar. 13, 2025                              
Payable Date Apr. 03, 2025                              
Per Share Amount ₱ 47                              
Total Amount ₱ 10,155