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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, 2024 | Dec. 31, 2023
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Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Noncurrent Financial Assets | ₱ 13,316 | ₱ 13,978
Current Financial Assets | 512 | 441
Plan Assets of Defined Benefit Pension Plans | 13,985 | 14,522
Smart and Subsidiaries [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Less: Employee’s share, forfeitures and mandatory reserve account | 1,526 | 1,335
Total Plan Assets of Defined Contribution Plans | 4,053 | 3,618
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 | 5,295 | 4,736
Smart and Subsidiaries [Member] | Current Financial Assets [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Plan Assets of Defined Benefit Pension Plans | 5,579 | 4,953
Parent [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Plan Assets of Defined Benefit Pension Plans | 13,828 | 14,419
Subsidiaries [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Plan Assets of Defined Benefit Pension Plans | 157 | 103
Unquoted Equity Investments [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Noncurrent Financial Assets | 10,774 | 9,439
Shares of Stocks [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Noncurrent Financial Assets | 1,983 | 2,017
Corporate Bonds and Loans Receivable [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Noncurrent Financial Assets | 303 | 2,287
Mutual Funds [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Noncurrent Financial Assets | 252 | 225
Government Securities [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Noncurrent Financial Assets | 4 | 10
Cash and Cash Equivalent [member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Current Financial Assets | 409 | 399
Cash and Cash Equivalent [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 | 284 | 217
Receivables [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Current Financial Assets | 103 | 42
Receivables [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 | 284 | 217
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 | 2,655 | 2,471
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 | 738 | 613
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 | 854 | 723
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 | 295 | 259
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 | ₱ 753 | ₱ 670

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