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Pension and Other Employee Benefits - Summary of Plan Assets of Defined Benefit Pension Plans (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Less: Employee’s share, forfeitures and mandatory reserve account | ₱ 1,364 | ₱ 635 |
Total Plan Assets of Defined Contribution Plans | 178 | 314 | ₱ 251
Smart and Subsidiaries [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 4,448 | 3,794 |
Total Plan Assets of Defined Contribution Plans | 3,084 | 3,159 |
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 | 4,414 | 2,902 |
Smart and Subsidiaries [Member] | Current Financial Assets [member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 34 | 892 |
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 | 32 | 891 |
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 | 1 |
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 | 1,993 | 1,854 |
International Equities Investment [Member] | Smart and Subsidiaries [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 1,114 | 550 |
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 | 1,114 | 550 |
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 | 516 | 165 |
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 | 649 | 333 |
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 | 142 |  |
Defined Benefit Plan Assets [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 13,068 | 12,941 |
Current Financial Assets | 449 | 507 |
Plan Assets of Defined Benefit Pension Plans | 13,724 | 13,539 |
Defined Benefit Plan Assets [Member] | Parent [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 13,517 | 13,448 |
Defined Benefit Plan Assets [Member] | Subsidiaries [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 207 | 91 |
Defined Benefit Plan Assets [Member] | Unquoted equity investments [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 10,815 | 10,707 |
Defined Benefit Plan Assets [Member] | Shares of stock [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 2,077 | 2,066 |
Defined Benefit Plan Assets [Member] | Corporate Bonds [member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 145 | 133 |
Defined Benefit Plan Assets [Member] | Government Securities [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 22 | 31 |
Defined Benefit Plan Assets [Member] | Mutual Funds [member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 9 | 4 |
Defined Benefit Plan Assets [Member] | Cash and Cash Equivalent [member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Current Financial Assets | 441 | 499 |
Defined Benefit Plan Assets [Member] | Receivables [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Current Financial Assets | ₱ 8 | ₱ 8 |

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