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Trade and Other Receivables - Summary of Changes in the Allowance for Expected Credit Losses (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year ₱ 17,202  
Balances at end of the year 16,825 ₱ 17,202
Trade and Other Receivables [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 16,904 16,503
Provisions 6,446 4,071
Reclassifications and reversals 5 (55)
Write-offs (7,087) (3,604)
Translation adjustments (17) (11)
Balances at end of the year 16,251 16,904
Trade and Other Receivables [Member] | Stage 2 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 1,763 1,595
Provisions 3,464 638
Reclassifications and reversals (1,213) (449)
Write-offs (40) (13)
Translation adjustments (14) (8)
Balances at end of the year 3,960 1,763
Trade and Other Receivables [Member] | Stage 3 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 15,141 14,908
Provisions 2,982 3,433
Reclassifications and reversals 1,218 394
Write-offs (7,047) (3,591)
Translation adjustments (3) (3)
Balances at end of the year 12,291 15,141
Trade and Other Receivables [Member] | Corporate subscribers [Member] | Stage 2 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 732 603
Provisions 1,020 211
Reclassifications and reversals (358) (80)
Write-offs   (1)
Translation adjustments (14) (1)
Balances at end of the year 1,380 732
Trade and Other Receivables [Member] | Corporate subscribers [Member] | Stage 3 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 3,870 3,906
Provisions 438 661
Reclassifications and reversals 324 201
Write-offs (1,151) (895)
Translation adjustments (3) (3)
Balances at end of the year 3,478 3,870
Trade and Other Receivables [Member] | Retail subscribers [Member] | Stage 2 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 926 893
Provisions 2,387 418
Reclassifications and reversals (840) (366)
Write-offs (40) (12)
Translation adjustments   (7)
Balances at end of the year 2,433 926
Trade and Other Receivables [Member] | Retail subscribers [Member] | Stage 3 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 9,766 8,931
Provisions 2,550 2,725
Reclassifications and reversals 1,015 793
Write-offs (5,774) (2,683)
Balances at end of the year 7,557 9,766
Trade and Other Receivables [Member] | Foreign administrations [Member] | Stage 2 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 3 5
Provisions 6  
Financial assets derecognized during the year   (2)
Balances at end of the year 9 3
Trade and Other Receivables [Member] | Foreign administrations [Member] | Stage 3 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 374 914
Provisions   64
Financial assets derecognized during the year (20)  
Reclassifications and reversals (111) (604)
Write-offs (16)  
Balances at end of the year 227 374
Trade and Other Receivables [Member] | Domestic carriers [Member] | Stage 2 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 4 3
Provisions   1
Financial assets derecognized during the year (1)  
Balances at end of the year 3 4
Trade and Other Receivables [Member] | Domestic carriers [Member] | Stage 3 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 86 74
Provisions   12
Financial assets derecognized during the year (3)  
Reclassifications and reversals (4)  
Write-offs (21)  
Balances at end of the year 58 86
Trade and Other Receivables [Member] | Dealers agents and others [Member] | Stage 2 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 98 91
Provisions 52 10
Reclassifications and reversals (15) (3)
Balances at end of the year 135 98
Trade and Other Receivables [Member] | Dealers agents and others [Member] | Stage 3 [Member]    
Disclosure Of Financial Assets [Line Items]    
Balances as at beginning of the year 1,045 1,083
Provisions 17  
Financial assets derecognized during the year   (29)
Reclassifications and reversals (6) 4
Write-offs (85) (13)
Balances at end of the year ₱ 971 ₱ 1,045