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Summary of Significant Accounting Policies - Summary of Subsidiaries (Detail)
 12 Months Ended
Mar. 24, 2000
Dec. 31, 2017
Dec. 31, 2016
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] | Direct [Member] | Wireless [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] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
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] | Indirect [Member] | Wireless [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] | Indirect [Member] | Wireless [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] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Far East Capital Limited and Subsidiary [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Cayman Islands  
Principal Business Activity   Cost effective off shore financing and risk management activities for Smart  
Far East Capital Limited and Subsidiary [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
PH Communications Holdings Corporation [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Investment company  
PH Communications Holdings Corporation [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Connectivity Unlimited Resource Enterprise [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Cellular mobile services  
Connectivity Unlimited Resource Enterprise [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Francom Holdings, Inc. [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Investment company  
Francom Holdings, Inc. [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Chikka Holdings Limited and Subsidiaries [Member] | 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 [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Voyager Innovations, Inc. [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Mobile applications and digital platforms developer  
Voyager Innovations, Inc. [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Voyager Innovations Holdings, Pte. Ltd. [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Singapore  
Principal Business Activity   Investment company  
Voyager Innovations Holdings, Pte. Ltd. [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Voyager Innovations Investments Pte. Ltd. [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Singapore  
Principal Business Activity   Investment company  
Voyager Innovations Investments Pte. Ltd. [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Voyager Innovations Singapore Pte. Ltd. [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Singapore  
Principal Business Activity   Development and maintenance of IT-based solutions for communications and e-Commerce platforms  
Voyager Innovations Singapore Pte. Ltd. [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Takatack Malaysia Sdn. Bhd. [Member] | Operating Segments [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Malaysia  
Principal Business Activity   Development,maintenance and support services to enable the digital commerce ecosystem  
Takatack Malaysia Sdn. Bhd. [Member] | Operating Segments [Member] | Indirect [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
iCommerce Investments Pte. Ltd. [Member] | Operating Segments [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Singapore  
Principal Business Activity   Investment company  
iCommerce Investments Pte. Ltd. [Member] | Operating Segments [Member] | Indirect [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership     100.00%
Voyager Fintech Ventures Pte. Ltd. [Member] | Operating Segments [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Singapore  
Principal Business Activity   Investment company  
Voyager Fintech Ventures Pte. Ltd. [Member] | Operating Segments [Member] | Indirect [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Fintqnologies Corporation [Member] | Operating Segments [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Development of financial technology innovations  
Fintqnologies Corporation [Member] | Operating Segments [Member] | Indirect [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Fintq Inventures Insurance Agency Corporation [Member] | Operating Segments [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Insurance company  
Fintq Inventures Insurance Agency Corporation [Member] | Operating Segments [Member] | Indirect [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
ePay Investments Pte. Ltd. [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Singapore  
Principal Business Activity   Investment company  
ePay Investments Pte. Ltd. [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
PayMaya Philippines, Inc. [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Provide and market certain mobile payment services  
PayMaya Philippines, Inc. [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
PayMaya Operations Philippines, Inc. [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Market, sell and distribute payment solutions and other related services  
PayMaya Operations Philippines, Inc. [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
ePay Investments Myanmar, Ltd [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Myanmar  
Principal Business Activity   Investment company  
ePay Investments Myanmar, Ltd [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00%  
3rd Brand Pte. Ltd. [Member] | Operating Segments [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Singapore  
Principal Business Activity   Solutions and systems integration services  
3rd Brand Pte. Ltd. [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   85.00% 85.00%
Wifun, Inc. [Member] | Operating Segments [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Software developer and selling of WiFi access equipment  
Wifun, Inc. [Member] | Operating Segments [Member] | Indirect [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Telesat, Inc. [Member] | Operating Segments [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Satellite communications services  
Telesat, Inc. [Member] | Operating Segments [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] | Direct [Member] | Wireless [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   88.50% 88.50%
ACeS Philippines Cellular Satellite Corporation [Member] | Operating Segments [Member] | Indirect [Member] | Wireless [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] | Indirect [Member] | Wireless [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] | Direct [Member] | Fixed Line [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] | Direct [Member] | Fixed Line [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] | Direct [Member] | Fixed Line [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   100.00% 100.00%
Smart-NTT Multimedia, Inc. [Member] | Operating Segments [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] | 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] | Direct [Member] | Fixed Line [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 infrastructureand solutions; intelligent data processing and implementation services and data analytics insight generation  
Talas Data Intelligence, Inc. [Member] | Operating Segments [Member] | Direct [Member] | Fixed Line [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] | Direct [Member] | Fixed Line [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] | Indirect [Member] | Fixed Line [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] | Indirect [Member] | Fixed Line [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] | Indirect [Member] | Fixed Line [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] | Indirect [Member] | Fixed Line [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   67.00% 67.00%
Net Games Inc | Operating Segments [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Gaming support services  
Net Games Inc | Operating Segments [Member] | Indirect [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   57.50% 57.50%
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] | Direct [Member] | Fixed Line [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   99.60% 99.60%
Digitel Information Technology Services, Inc. [Member] | Operating Segments [Member]      
Disclosure of subsidiaries [Line Items]      
Place of Incorporation   Philippines  
Principal Business Activity   Internet services  
Digitel Information Technology Services, Inc. [Member] | Operating Segments [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] | Direct [Member] | Fixed Line [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] | Direct [Member] | Fixed Line [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] | Direct [Member] | Fixed Line [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   65.00% 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   Internal distributor of Filipino channels and content  
Pilipinas Global Network Limited and Subsidiaries [Member] | Operating Segments [Member] | Direct [Member] | Fixed Line [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] | Direct [Member] | Others [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] | Direct [Member] | Others [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] | Direct [Member] | Others [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] | Indirect [Member] | Others [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] | Indirect [Member] | Others [Member]      
Disclosure of subsidiaries [Line Items]      
Percentage of Ownership   99.90% 99.90%