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Trade and Other Receivables - Summary of Changes in Allowance for Doubtful Accounts (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Financial Assets [Line Items] |  |  |
Balance as at beginning of the year | ₱ 14,723 |  |
Balance at end of the year | 16,739 | ₱ 14,723 |
Impairment | 164 |  | ₱ 36
Trade receivables [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Balance as at beginning of the year | 14,501 | 18,788 |
Provisions (reversals) and other adjustments |  | (1,029) |
Write-offs |  | (3,258) |
Balance at end of the year |  | 14,501 | 18,788
Gross amount of receivables individually impaired, before deducting any impairment allowance |  | 10,160 |
Trade receivables [Member] | Individual impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 10,160 |
Trade receivables [Member] | Collective impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 4,341 |
Trade receivables [Member] | Retail subscribers [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Balance as at beginning of the year | 8,778 | 12,588 |
Provisions (reversals) and other adjustments |  | (1,166) |
Write-offs |  | (2,644) |
Balance at end of the year |  | 8,778 | 12,588
Gross amount of receivables individually impaired, before deducting any impairment allowance |  | 5,747 |
Trade receivables [Member] | Retail subscribers [Member] | Individual impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 5,747 |
Trade receivables [Member] | Retail subscribers [Member] | Collective impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 3,031 |
Trade receivables [Member] | Corporate subscribers [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Balance as at beginning of the year | 3,304 | 3,827 |
Provisions (reversals) and other adjustments |  | 15 |
Write-offs |  | (538) |
Balance at end of the year |  | 3,304 | 3,827
Gross amount of receivables individually impaired, before deducting any impairment allowance |  | 3,177 |
Trade receivables [Member] | Corporate subscribers [Member] | Individual impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 3,177 |
Trade receivables [Member] | Corporate subscribers [Member] | Collective impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 127 |
Trade receivables [Member] | Foreign administrations [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Balance as at beginning of the year | 938 | 628 |
Provisions (reversals) and other adjustments |  | 310 |
Balance at end of the year |  | 938 | 628
Gross amount of receivables individually impaired, before deducting any impairment allowance |  | 104 |
Trade receivables [Member] | Foreign administrations [Member] | Individual impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 104 |
Trade receivables [Member] | Foreign administrations [Member] | Collective impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 834 |
Trade receivables [Member] | Domestic carriers [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Balance as at beginning of the year | 75 | 134 |
Provisions (reversals) and other adjustments |  | (59) |
Balance at end of the year |  | 75 | 134
Gross amount of receivables individually impaired, before deducting any impairment allowance |  | 51 |
Trade receivables [Member] | Domestic carriers [Member] | Individual impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 51 |
Trade receivables [Member] | Domestic carriers [Member] | Collective impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 24 |
Trade receivables [Member] | Dealers agents and others [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Balance as at beginning of the year | ₱ 1,406 | 1,611 |
Provisions (reversals) and other adjustments |  | (129) |
Write-offs |  | (76) |
Balance at end of the year |  | 1,406 | ₱ 1,611
Gross amount of receivables individually impaired, before deducting any impairment allowance |  | 1,081 |
Trade receivables [Member] | Dealers agents and others [Member] | Individual impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | 1,081 |
Trade receivables [Member] | Dealers agents and others [Member] | Collective impairment [Member] |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |
Impairment |  | ₱ 325 |

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