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Goodwill and Intangible Assets - Additional Information (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Intangible Assets [Line Items]      
Amortization during the year ₱ 2,496 ₱ 758 ₱ 892
Intangible assets 3,950 6,446  
Accumulated depreciation, impairment and amortization [Member]      
Disclosure Of Intangible Assets [Line Items]      
Amortization during the year 2,496 758  
Accumulated depreciation, impairment and amortization [Member] | PLDT Inc. [Member] | Digital Telecommunications Phils., Inc. [Member]      
Disclosure Of Intangible Assets [Line Items]      
Accumulated impairment balance 438 438  
Accumulated depreciation, impairment and amortization [Member] | ePLDT, Inc. [Member] | ABM Global Solutions, Inc. and Subsidiaries [Member]      
Disclosure Of Intangible Assets [Line Items]      
Accumulated impairment balance 216 216  
Wireless [Member]      
Disclosure Of Intangible Assets [Line Items]      
Intangible assets ₱ 3,950 6,446  
Pre-tax discount rates applied to cash flow projections 8.08%    
Growth rate of cash flows beyond the projection of three years 2.00%    
Impairment loss relating to goodwill ₱ 0 0  
Fixed Line [Member]      
Disclosure Of Intangible Assets [Line Items]      
Pre-tax discount rates applied to cash flow projections 8.08%    
Growth rate of cash flows beyond the projection of three years 2.00%    
Impairment loss relating to goodwill ₱ 0 ₱ 0  
Sun Trademark [Member]      
Disclosure Of Intangible Assets [Line Items]      
Amortization during the year 1,877    
Intangible assets ₱ 2,628