Operating Segment Information - Additional Information (Detail)	12 Months Ended
Dec. 31, 2017 Segment
Disclosure Of Operating Segments [Abstract]
Number of operating segments	3
Total percentage of consolidated fixed line subscribers contributed by subsidiaries	4.00%

Total percentage of consolidated fixed line subscribers contributed by subsidiaries.

No definition available.

Name:	phi_TotalPercentageOfConsolidatedFixedLineSubscribersContributedBySubsidiaries
Namespace Prefix:	phi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration