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Pension and Other Employee Benefits - Summary of Plan Assets of Defined Benefit Pension Plans (Detail) - Defined Benefit Plan Assets [Member] - PHP (₱)
₱ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Noncurrent Financial Assets ₱ 13,914 ₱ 12,983
Current Financial Assets 523 1,779
Plan Assets of Defined Benefit Pension Plans 14,683 15,000
Less: Employee’s share, forfeitures and mandatory reserve account 1,356 1,201
Total Plan Assets of Defined Contribution Plans 4,137 3,651
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 5,456 4,464
Smart and Subsidiaries [Member] | Current Financial Assets [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Plan Assets of Defined Benefit Pension Plans 5,493 4,852
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 37 388
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 37 388
Parent [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Plan Assets of Defined Benefit Pension Plans 14,437 14,762
Subsidiaries [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Plan Assets of Defined Benefit Pension Plans 246 238
Unquoted Equity Investments [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Noncurrent Financial Assets 11,332 10,728
Shares of Stocks [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Noncurrent Financial Assets 2,316 1,903
Corporate Bonds [member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Noncurrent Financial Assets 242 255
Government Securities [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Noncurrent Financial Assets 7 76
Mutual Funds [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Noncurrent Financial Assets 17 21
Cash and Cash Equivalent [member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Current Financial Assets 518 1,771
Receivables [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Current Financial Assets 5 8
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 2,833 2,416
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 997 832
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 844 902
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 224 74
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 ₱ 558 ₱ 240