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Notes to the Statements of Cash Flows - Summary of Changes in Liabilities Arising From Financing Activities (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance   ₱ 179,236 ₱ 175,511
Cash flows     (17,934)
Foreign exchange movement     1,723
Others     19,936
Ending balance     179,236
Interest-bearing financial liabilities [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance ₱ 192,556 176,276 172,611
Cash flows 31,979 16,811 1,722
Foreign exchange movement (1,917) (653) 1,723
Others 147 122 220
Ending balance 222,765 192,556 176,276
Lease liabilities [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance 16,315 15,233  
Cash flows (5,781) (5,399)  
Others 9,491 6,481  
Ending balance 20,025 16,315 15,233
Derivative Financial Labilities [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance 113 80 149
Cash flows (430) (50) 886
Others 853 83 (955)
Ending balance 536 113 80
Accrued interests and other related costs [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance 1,531 1,347 1,176
Cash flows (8,348) (7,143) (6,614)
Others 8,689 7,327 6,785
Ending balance 1,872 1,531 1,347
Dividends Payable [Member]      
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]      
Beginning balance 1,584 1,533 1,575
Cash flows (16,721) (15,592) (13,928)
Others 16,331 15,643 13,886
Ending balance ₱ 1,194 ₱ 1,584 ₱ 1,533