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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
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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 |

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