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Summary of Significant Accounting Policies - Summary of Decrease in Par Value of Common Stock and Decrease in Authorized Capital Stock (Detail) - ₱ / shares shares in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Common Stock [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Number of shares authorized | 234 | 234
Number of shares issued | 219 | 219
Prior to Amendments [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Number of shares authorized | 12,177 |
Number of shares issued | 84 |
Prior to Amendments [Member] | Common Stock [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Number of shares authorized | 12,060 |
Number of shares issued | 1 |
Par value | ₱ 21,000 |
Prior to Amendments [Member] | Class I Preferred Stock [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Number of shares authorized | 67 |
Number of shares issued | 33 |
Par value | ₱ 2 |
Prior to Amendments [Member] | Class II Preferred Stock [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Number of shares authorized | 50 |
Number of shares issued | 50 |
Par value | ₱ 1 |
After Amendments [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Number of shares authorized | 5,113 |
Number of shares issued | 84 |
After Amendments [Member] | Common Stock [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Number of shares authorized | 4,996 |
Number of shares issued | 1 |
Par value | ₱ 8,700 |
After Amendments [Member] | Class I Preferred Stock [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Number of shares authorized | 67 |
Number of shares issued | 33 |
Par value | ₱ 2 |
After Amendments [Member] | Class II Preferred Stock [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Number of shares authorized | 50 |
Number of shares issued | 50 |
Par value | ₱ 1 |

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