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Pension and Other Employee Benefits - Summary of Plan Assets of Defined Benefit Pension Plans (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Total Plan Assets of Defined Contribution Plans ₱ 270 ₱ 178 ₱ 314
International Equities Investment [Member] | Smart and Subsidiaries [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 902 1,114  
Defined Benefit Plan Assets [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Noncurrent Financial Assets 12,983 13,068  
Current Financial Assets 1,779 449  
Plan Assets of Defined Benefit Pension Plans 15,000 13,724  
Less: Employee’s share, forfeitures and mandatory reserve account 1,201 1,364  
Total Plan Assets of Defined Contribution Plans 3,651 3,084  
Defined Benefit Plan Assets [Member] | Smart and Subsidiaries [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 4,852 4,448  
Defined Benefit Plan Assets [Member] | Smart and Subsidiaries [Member] | Non-current financial assets [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 4,464 4,414  
Defined Benefit Plan Assets [Member] | Smart and Subsidiaries [Member] | Current Financial Assets [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 388 34  
Defined Benefit Plan Assets [Member] | Smart and Subsidiaries [Member] | Current Financial Assets [member] | Cash and Cash Equivalent [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 388 32  
Defined Benefit Plan Assets [Member] | Smart and Subsidiaries [Member] | Current Financial Assets [member] | Receivables [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans   2  
Defined Benefit Plan Assets [Member] | Parent [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 14,762 13,517  
Defined Benefit Plan Assets [Member] | Subsidiaries [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 238 207  
Defined Benefit Plan Assets [Member] | Unquoted equity investments [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Noncurrent Financial Assets 10,728 10,815  
Defined Benefit Plan Assets [Member] | Shares of stock [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Noncurrent Financial Assets 1,903 2,077  
Defined Benefit Plan Assets [Member] | Corporate Bonds [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Noncurrent Financial Assets 255 145  
Defined Benefit Plan Assets [Member] | Government Securities [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Noncurrent Financial Assets 76 22  
Defined Benefit Plan Assets [Member] | Mutual Funds [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Noncurrent Financial Assets 21 9  
Defined Benefit Plan Assets [Member] | Cash and Cash Equivalent [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Current Financial Assets 1,771 441  
Defined Benefit Plan Assets [Member] | Receivables [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Current Financial Assets 8 8  
Defined Benefit Plan Assets [Member] | Domestic Fixed Income Investment [Member] | Smart and Subsidiaries [Member] | Non-current financial assets [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 2,416 1,993  
Defined Benefit Plan Assets [Member] | International Equities Investment [Member] | Smart and Subsidiaries [Member] | Non-current financial assets [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 902 1,114  
Defined Benefit Plan Assets [Member] | Domestic Equities Investment [Member] | Smart and Subsidiaries [Member] | Non-current financial assets [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 832 649  
Defined Benefit Plan Assets [Member] | Philippine Foreign Currency Bonds Investment [Member] | Smart and Subsidiaries [Member] | Non-current financial assets [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans 240 516  
Defined Benefit Plan Assets [Member] | International Fixed Income Investment [Member] | Smart and Subsidiaries [Member] | Non-current financial assets [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Plan Assets of Defined Benefit Pension Plans ₱ 74 ₱ 142