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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Financial Assets [Line Items]    
Trade and other receivables ₱ 22,053 ₱ 22,436
Costs [Member]    
Disclosure Of Financial Assets [Line Items]    
Trade and other receivables 38,304 39,340
Costs [Member] | Retail subscribers [Member]    
Disclosure Of Financial Assets [Line Items]    
Trade and other receivables 17,142 17,178
Costs [Member] | Corporate subscribers [Member]    
Disclosure Of Financial Assets [Line Items]    
Trade and other receivables 13,318 13,005
Costs [Member] | Foreign administrations [Member]    
Disclosure Of Financial Assets [Line Items]    
Trade and other receivables 1,520 1,896
Costs [Member] | Domestic carriers [Member]    
Disclosure Of Financial Assets [Line Items]    
Trade and other receivables 226 889
Costs [Member] | Dealers agents and others [Member]    
Disclosure Of Financial Assets [Line Items]    
Trade and other receivables 6,098 6,372
Accumulated provision for expected credit losses [Member]    
Disclosure Of Financial Assets [Line Items]    
Trade and other receivables ₱ 16,251 ₱ 16,904