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Employee Benefits - Summary of Plan Assets of Defined Benefit Pension Plans (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Total Plan Assets of Defined Contribution Plans | ₱ 314 | ₱ 251 | ₱ 238
Smart and Subsidiaries [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 3,794 | 3,728 |
Employee’s share, forfeitures and mandatory reserve account | 635 | 866 |
Total Plan Assets of Defined Contribution Plans | 3,159 | 2,862 |
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 | 2,902 | 3,567 |
Smart and Subsidiaries [Member] | Current Financial Assets [member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 892 | 161 |
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 | 891 | 153 |
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 | 1 | 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 | 1,854 | 1,721 |
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 |  | 361 |
International Equities Investment [Member] | Smart and Subsidiaries [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 550 | 557 |
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 | 550 | 557 |
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 | 333 | 555 |
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 | 165 | 373 |
Defined Benefit Plan Assets [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 12,941 | 12,049 |
Current Financial Assets | 507 | 400 |
Plan Assets of Defined Benefit Pension Plans | 13,539 | 12,534 |
Defined Benefit Plan Assets [Member] | Parent [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 13,448 | 12,449 |
Defined Benefit Plan Assets [Member] | Subsidiaries [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Plan Assets of Defined Benefit Pension Plans | 91 | 85 |
Defined Benefit Plan Assets [Member] | Unlisted equity investments [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 10,707 | 9,372 |
Defined Benefit Plan Assets [Member] | Shares of stock [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 2,066 | 2,510 |
Defined Benefit Plan Assets [Member] | Corporate Bonds [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 133 | 111 |
Defined Benefit Plan Assets [Member] | Government Securities [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 31 | 22 |
Defined Benefit Plan Assets [Member] | Mutual Funds [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets | 4 | 30 |
Defined Benefit Plan Assets [Member] | Investment Property [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Noncurrent Financial Assets |  | 4 |
Defined Benefit Plan Assets [Member] | Cash and Cash Equivalent [member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Current Financial Assets | 499 | 396 |
Defined Benefit Plan Assets [Member] | Receivables [Member] |  |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |  |
Current Financial Assets | ₱ 8 | ₱ 4 |

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