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Summary of Significant Accounting Policies - Additional Information (Detail) ₱ / shares in Units, shares in Thousands, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 07, 2019 PHP (₱) | Nov. 28, 2018 USD ($) | Aug. 07, 2018 PHP (₱) | Jul. 31, 2018 PHP (₱) | Mar. 05, 2018 PHP (₱) | Dec. 18, 2017 PHP (₱) | Dec. 14, 2017 USD ($) $ / shares shares | Dec. 14, 2017 USD ($) shares | Nov. 30, 2017 USD ($) | Sep. 26, 2017 | Jun. 13, 2017 PHP (₱) | May 30, 2016 PHP (₱) | Apr. 14, 2015 PHP (₱) | Jun. 24, 2014 PHP (₱) | Jun. 30, 2012 PHP (₱) | Mar. 24, 2000 | Dec. 31, 2019 PHP (₱) shares | Dec. 31, 2018 PHP (₱) shares | Sep. 24, 2019 PHP (₱) | Sep. 13, 2019 PHP (₱) | Aug. 15, 2019 PHP (₱) | Jan. 01, 2019 PHP (₱) | Dec. 31, 2017 PHP (₱) | May 30, 2017 PHP (₱) ₱ / shares shares | May 29, 2017 PHP (₱) ₱ / shares shares | Oct. 26, 2011
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  | ₱ 1,152,000,000 |  | ₱ 1,294,000,000 |  |  |  |  | ₱ 21,800,000,000 | ₱ 26,200,000,000 | ₱ 26,487,000,000 | ₱ 13,243,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  |  |  |  | ₱ 52,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of lease term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 15,890,000,000 |  |  |  |  |  |  |  |  |
Deferred income tax assets decrease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (23,623,000,000) | ₱ (27,697,000,000) |  |  |  |  | ₱ (30,466,000,000) |  |  |
Prepayments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,231,000,000 | 31,718,000,000 |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,815,000,000 | 95,724,000,000 |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,315,000,000 | 15,233,000,000 |  |  |  | ₱ 15,233,000,000 |  |  |  |
Deferred credits and other noncurrent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,557,000,000) | (5,284,000,000) |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,063,000,000) | (12,081,000,000) |  |  |  |  |  |  |  |
Noncontrolling interests (Note 6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,303,000,000 | 4,308,000,000 |  |  |  |  |  |  |  |
ECL recognized on investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 0 |  |  |  |  |  |  |  |  |
Description of debt investment security credit risk |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | debt instruments to have low credit risk when its credit risk rating is equivalent to the globally understood definition of ‘investment grade’, or when the exposure is less than 30 days past due. |  |  |  |  |  |  |  |  |
Transaction price allocated to remaining performance obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 22,864,000,000 | ₱ 30,753,000,000 |  |  |  |  |  |  |  |
Less than 1 year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining performance obligations percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68.00% | 63.00% |  |  |  |  |  |  |  |
1-2 years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining performance obligations percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32.00% | 37.00% |  |  |  |  |  |  |  |
Increase Decrease Due To Application Of IFRS 16 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 15,890,000,000 |  |  |  |  | 14,226,000,000 |  |  |  |
Finance lease recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |
Deferred income tax assets decrease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (395,000,000) |  |  |  |  | (172,000,000) |  |  |  |
Prepayments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (471,000,000) |  |  |  |
Accrued expenses and other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 594,000,000 |  |  |  |  | (577,000,000) |  |  |  |
Lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,233,000,000 |  |  |  |
Deferred credits and other noncurrent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  | 50,000,000 |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,045,000,000 |  |  |  |  | 924,000,000 |  |  |  |
Increase Decrease Due To Application Of IFRS 16 [Member] | Property Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 245,000,000 |  |  |  |
IAS 17 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax assets decrease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (23,228,000,000) |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,221,000,000 |  |  |  |  | ₱ 577,000,000 |  |  |  |
Deferred credits and other noncurrent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,607,000,000) |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 20,898,000,000 |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 234,000 | 234,000 |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 219,000 | 219,000 |  |  |  |  |  |  |  |
Trademark [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization method |  |  |  |  |  |  |  |  |  | straight-line method of accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subscription Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization method |  |  |  |  |  |  |  |  |  | straight-line method of accounting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Metro Pacific Investments Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized capital amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 2,028,000,000 | ₱ 1,602,000,000 |
Number of shares authorized | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 | 20,000 |
Par value | ₱ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 100.00 | ₱ 79.00 |
Voyager Innovations Holdings, Pte. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) | $ |  | $ (175.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Digital Telecommunications Phils., Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest in subsidiary acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.60%
Smart Communications, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Amount paid to minority shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 6,825,000,000 |  |  |  |  |  |  |  |  |
Smart Communications, Inc. [Member] | Red Mobile [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 18,000,000 |  |  |  |  |  |  |  |  |  |  |
Connectivity Unlimited Resource Enterprise [Member] | PH Communications Holdings Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 97.00% |  |  |  |  |  |  |  |
Connectivity Unlimited Resource Enterprise [Member] | Francom Holdings, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
iCommerce Investments Pte. Ltd. [Member] | Voyager Innovations Holdings, Pte. Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) | $ |  |  |  |  |  |  |  | $ 8.9 | $ 8.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivables | $ |  |  |  |  |  |  | $ 8.6 | $ 8.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
iCommerce Investments Pte. Ltd. [Member] | Voyager Innovations Holdings, Pte. Ltd. [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  |  | 10 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of ordinary shares | $ / shares |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Primeworld Digital Systems, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest in subsidiary acquired | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) | ₱ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership | 100.00% |  | 95.00% |  | 67.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Investments |  |  | ₱ 66,000,000 |  | ₱ 134,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PLDT Communications and Energy Ventures, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid to minority shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 4,000,000 |  |  |  |  |  |  |  |  |
Philcom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 319,000,000 | ₱ 1,760,000,000 |  |  |  |  |
SubicTel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 675,000,000 |  |  |  |  |  |  |
Maratel Subscribers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred | ₱ 442,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 40 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_40_a&doctype=Standard -URIDate 2019-03-27 + Details
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