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Summary of Significant Accounting Policies - Summary of Operating Lease Commitments (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of subsidiaries [Line Items]      
Operating lease commitments as at December 31, 2018 ₱ 10 ₱ 10,571 ₱ 22,674
Less: Commitments relating to short-term leases   (49)  
Commitments relating to service contracts   (304)  
Add: Payments in optional extension periods not recognized as at December 31, 2018   4,994  
Prepayments and accrued expenses (IAS 17)   21  
Lease liabilities as at January 1, 2019 ₱ 16,315 ₱ 15,233 ₱ 15,233
Bottom of range [member]      
Disclosure of subsidiaries [Line Items]      
Incremental borrowing rate as at January 1, 2019   7.00%  
Top of range [member]      
Disclosure of subsidiaries [Line Items]      
Incremental borrowing rate as at January 1, 2019   9.00%