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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
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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

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