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Summary of Significant Accounting Policies - Summary of Subsidiaries (Detail) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 07, 2019 | Aug. 07, 2018 | Mar. 05, 2018 | Mar. 24, 2000 | Dec. 31, 2020 | Dec. 31, 2019
Smart Communications, Inc. [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  | 100.00% |  |
Smart Communications, Inc. [Member] | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Cellular mobile services |
Smart Communications, Inc. [Member] | Operating Segments [Member] | Wireless [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Smart Broadband, Inc. and Subsidiary [Member] | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Internet broadband distribution services |
Smart Broadband, Inc. and Subsidiary [Member] | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Primeworld Digital Systems, Inc. [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership | 100.00% | 95.00% | 67.00% |  |  |
Primeworld Digital Systems, Inc. [Member] | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Internet broadband distribution services |
Primeworld Digital Systems, Inc. [Member] | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
I-Contacts Corporation [Member] | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Operations support servicing business |
I-Contacts Corporation [Member] | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Smart Money Holdings Corporation [Member] | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Cayman Islands |
Principal Business Activity |  |  |  |  | Investment company |
Smart Money Holdings Corporation [Member] | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Far East Capital Limited | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Cayman Islands |
Principal Business Activity |  |  |  |  | Cost effective offshore financing and risk management activities for Smart |
Far East Capital Limited | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Ph Communications Holdings Corporation | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Investment company |
Ph Communications Holdings Corporation | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Connectivity Unlimited Resource Enterprise | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Cellular mobile services |
Connectivity Unlimited Resource Enterprise | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Francom Holdings Inc | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Investment company |
Francom Holdings Inc | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Chikka Holdings Limited And Subsidiaries | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | British Virgin Islands |
Principal Business Activity |  |  |  |  | Content provider, mobile applications development and services |
Chikka Holdings Limited And Subsidiaries | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Wi Fun Inc | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Software developer and selling of WiFi access equipment |
Wi Fun Inc | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Telesat Inc | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Satellite communications services |
Telesat Inc | Operating Segments [Member] | Wireless [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
ACeS Philippines Cellular Satellite Corporation [Member] | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Satellite information and messaging services |
ACeS Philippines Cellular Satellite Corporation [Member] | Operating Segments [Member] | Wireless [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 88.50% | 88.50%
ACeS Philippines Cellular Satellite Corporation [Member] | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 11.50% | 11.50%
Digitel Mobile Philippines, Inc. [Member] | Operating Segments [Member] | Wireless [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Cellular mobile services |
Digitel Mobile Philippines, Inc. [Member] | Operating Segments [Member] | Wireless [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 99.60% | 99.60%
PLDT Clark Telecom, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Telecommunications services |
PLDT Clark Telecom, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
PLDT Subic Telecom, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Telecommunications services |
PLDT Subic Telecom, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
PLDT Global Corporation and Subsidiaries [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | British Virgin Islands |
Principal Business Activity |  |  |  |  | Telecommunications services |
PLDT Global Corporation and Subsidiaries [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Smart-NTT Multimedia, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Data and network services |
Smart-NTT Multimedia, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
PLDT-Philcom, Inc. and Subsidiaries [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Telecommunications services |
PLDT-Philcom, Inc. and Subsidiaries [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Talas Data Intelligence, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Business infrastructure and solutions; intelligent data processing and implementation services and data analytics insight generation |
Talas Data Intelligence, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
ePLDT, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Information and communications infrastructure for internet-based services, e-commerce, customer relationship management and IT related services |
ePLDT, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
IP Converge Data Services, Inc. and Subsidiary [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Information and communications infrastructure for internet-based services, e-commerce, customer relationship management and IT related services |
IP Converge Data Services, Inc. and Subsidiary [Member] | Operating Segments [Member] | Fixed Line [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Curo Teknika, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Managed IT outsourcing |
Curo Teknika, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
ABM Global Solutions, Inc. and Subsidiaries [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Internet-based purchasing, IT consulting and professional services |
ABM Global Solutions, Inc. and Subsidiaries [Member] | Operating Segments [Member] | Fixed Line [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
ePDS, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Bills printing and other related value-added services, or VAS |
ePDS, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Net Games Inc [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Gaming support services |
Net Games Inc [Member] | Operating Segments [Member] | Fixed Line [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 57.50% | 57.50%
MVP Rewards Loyalty Solutions, Inc [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Full-services customer rewards and loyalty programs |
MVP Rewards Loyalty Solutions, Inc [Member] | Operating Segments [Member] | Fixed Line [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Digital Telecommunications Phils., Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Telecommunications services |
Digital Telecommunications Phils., Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 99.60% | 99.60%
Digitel Information Technology Services, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Internet services |
Digitel Information Technology Services, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 99.60% | 99.60%
PLDT-Maratel, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Telecommunications services |
PLDT-Maratel, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 98.00% | 98.00%
Bonifacio Communications Corporation [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Telecommunications, infrastructure and related VAS |
Bonifacio Communications Corporation [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 75.00% | 75.00%
Pacific Global One Aviation Company, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Air transportation business |
Pacific Global One Aviation Company, Inc. [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 65.30% | 65.00%
Pilipinas Global Network Limited and Subsidiaries [Member] | Operating Segments [Member] | Fixed Line [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | British Virgin Islands |
Principal Business Activity |  |  |  |  | International distributor of Filipino channels and content |
Pilipinas Global Network Limited and Subsidiaries [Member] | Operating Segments [Member] | Fixed Line [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 64.60% | 64.60%
PLDT Global Investments Holdings, Inc. [Member] | Operating Segments [Member] | Others [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Investment company |
PLDT Global Investments Holdings, Inc. [Member] | Operating Segments [Member] | Others [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
PLDT Digital Investments Pte. Ltd. and Subsidiaries [Member] | Operating Segments [Member] | Others [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Singapore |
Principal Business Activity |  |  |  |  | Investment company |
PLDT Digital Investments Pte. Ltd. and Subsidiaries [Member] | Operating Segments [Member] | Others [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
Mabuhay Investments Corporation, or MIC [Member] | Operating Segments [Member] | Others [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Investment company |
Mabuhay Investments Corporation, or MIC [Member] | Operating Segments [Member] | Others [Member] | Direct [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 67.00% | 67.00%
PLDT Global Investments Corporation [Member] | Operating Segments [Member] | Others [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | British Virgin Islands |
Principal Business Activity |  |  |  |  | Investment company |
PLDT Global Investments Corporation [Member] | Operating Segments [Member] | Others [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 100.00% | 100.00%
PLDT Communications and Energy Ventures, Inc. [Member] | Operating Segments [Member] | Others [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Place of Incorporation |  |  |  |  | Philippines |
Principal Business Activity |  |  |  |  | Investment company |
PLDT Communications and Energy Ventures, Inc. [Member] | Operating Segments [Member] | Others [Member] | Indirect [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 99.90% | 99.90%

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