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Investments in Associates and Joint Ventures - Summary of Sale of PCEV Shares to MPIC (Detail) - PHP (₱) ₱ in Millions |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Dec. 18, 2017 | Jun. 13, 2017 | May 30, 2016 | Apr. 14, 2015 | Jun. 24, 2014 | Jun. 06, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares Sold |  |  |  |  | 112,710,000 | 56,350,000 |  |  |  |
Selling Price | ₱ 1,152 | ₱ 1,294 | ₱ 21,800 | ₱ 26,200 | ₱ 26,487 | ₱ 13,243 |  |  |  |
Realized portion of deferred gain on the transfer of Beacon and Manila Electric Company, or Meralco, shares |  |  | ₱ 4,962 | ₱ 4,962 | ₱ 2,838 | ₱ 1,418 |  | ₱ 144 | ₱ 6,512 | ₱ 7,365
Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares Sold |  |  | 458,000,000 | 458,000,000 |  |  | 282,000,000 |  |  |
Selling Price |  |  |  |  |  |  | ₱ 3,563 |  |  |
Realized portion of deferred gain on the transfer of Beacon and Manila Electric Company, or Meralco, shares |  |  |  |  |  |  | ₱ 2,012 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Shares Sold |  |  | 646,000,000 | 646,000,000 |  |  |  |  |  |

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- Definition Adjustments for gain (loss) on disposals investments in subsidiaries, joint ventures and associates to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries, joint ventures and associates; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20&doctype=Standard -URIDate 2018-03-16 + Details
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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 2018-01-01 -Paragraph 40 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_40_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Number of shares sold by joint venture to other entity. + References No definition available. + Details
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