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Inventories and Supplies (Tables) | 12 Months Ended
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Dec. 31, 2020
Classes Of Inventories [Abstract] |
Summary of Inventories and Supplies | As at December 31, 2020 and 2019, this account consists of:
|  | 2020 |  |  | 2019 |
|  | (in million pesos) |
Commercial: |  |  |  |  |  |  |  |
At net realizable value(1) |  |  | 1,406 |  |  |  | 2,463 |
At cost |  |  | 1,755 |  |  |  | 3,253 |
Network: |  |  |  |  |  |  |  |
At net realizable value(1) |  |  | 420 |  |  |  | 592 |
At cost |  |  | 1,445 |  |  |  | 1,738 |
Others: |  |  |  |  |  |  |  |
At net realizable value(1) |  |  | 2,259 |  |  |  | 357 |
At cost |  |  | 3,248 |  |  |  | 718 |
Total inventories and supplies at the lower of cost or net realizable value |  |  | 4,085 |  |  |  | 3,412 |
| (1) | Amounts are net of allowance for inventory obsolescence and write-downs.
Summary of Cost of Inventories and Supplies Recognized as Expense | The cost of inventories and supplies recognized as expense for the years ended December 31, 2020, 2019 and 2018 are as follows:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in million pesos) |
Cost of sales |  |  | 8,882 |  |  |  | 9,528 |  |  |  | 10,630 |
Provisions (Note 5) |  |  | 934 |  |  |  | 471 |  |  |  | 1,528 |
Repairs and maintenance |  |  | 613 |  |  |  | 823 |  |  |  | 688 |
Selling and promotions |  |  | 3 |  |  |  | 138 |  |  |  | 43 |
|  |  | 10,432 |  |  |  | 10,960 |  |  |  | 12,889 |
Summary of Changes in Allowance for Inventory Obsolescence and Write-down | Changes in the allowance for inventory obsolescence and write-down for the years ended December 31, 2020 and 2019 are as follows:
|  | 2020 |  |  | 2019 |
|  | (in million pesos) |
Balances at beginning of the year |  |  | 2,303 |  |  |  | 3,212 |
Provisions (Note 5) |  |  | 934 |  |  |  | 471 |
Translation revaluation |  |  | (1 | ) |  |  | — |
Write-off |  |  | (56 | ) |  |  | (136 | )
Reclassification |  |  | (209 | ) |  |  | (220 | )
Cost of sales |  |  | (262 | ) |  |  | (495 | )
Reversals |  |  | (346 | ) |  |  | (529 | )
Balances at end of the year |  |  | 2,363 |  |  |  | 2,303 |

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