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Net Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Analysis Of Income And Expense [Abstract] |
Other Income and Expenses |
| a. | Other income and expenses
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Gain (loss) on disposal of property, plant and equipment |  | $ | 142 |  |  | $ | (38 | ) |  | $ | 1,428 |
Impairment loss on property, plant and equipment |  |  | — |  |  |  | (93 | ) |  |  | — |
Gain on disposal of investment properties |  |  | — |  |  |  | — |  |  |  | 151 |
Reversal of impairment loss on investment properties |  |  | 19 |  |  |  | 57 |  |  |  | 27 |
Loss on disposal of intangible assets |  |  | — |  |  |  | — |  |  |  | (2 | )
Impairment loss on intangible assets |  |  | (51 | ) |  |  | (9 | ) |  |  | (9 | )
Impairment loss on other assets |  |  | — |  |  |  | (44 | ) |  |  | — |
|  | $ | 110 |  |  | $ | (127 | ) |  | $ | 1,595 |
Other Income |
| b. | Other income
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Dividend income |  | $ | 396 |  |  | $ | 296 |  |  | $ | 246 |
Rental income |  |  | 70 |  |  |  | 85 |  |  |  | 70 |
Others |  |  | 234 |  |  |  | 150 |  |  |  | 154 |
|  | $ | 700 |  |  | $ | 531 |  |  | $ | 470 |
Other Gains and Losses |
| c. | Other gains and losses
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Foreign currency exchange gain or loss, net |  | $ | 37 |  |  | $ | 16 |  |  | $ | (47 | )
Gain or loss on disposal of investments accounted for using equity method |  |  | — |  |  |  | 151 |  |  |  | 10 |
Gain (loss) on disposal of financial instruments |  |  | 6 |  |  |  | 4 |  |  |  | (2 | )
Valuation gain or loss on financial assets and liabilities at fair value through profit or loss, net |  |  | (21 | ) |  |  | (38 | ) |  |  | (99 | )
Others |  |  | (68 | ) |  |  | (49 | ) |  |  | (21 | )
|  | $ | (46 | ) |  | $ | 84 |  |  | $ | (159 | )
Interest Expenses |
| d. | Interest expenses
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Interest paid to financial institutions |  | $ | 16 |  |  | $ | 17 |  |  | $ | 79 |
Interest on lease liabilities |  |  | — |  |  |  | 85 |  |  |  | 80 |
Interest on bonds payable |  |  | — |  |  |  | — |  |  |  | 46 |
Others |  |  | 2 |  |  |  | 2 |  |  |  | 1 |
|  | $ | 18 |  |  | $ | 104 |  |  | $ | 206 |
Impairment Loss (Reversal of Impairment Loss) on Financial Instruments and Non-financial Assets |
| e. | Impairment loss (reversal of impairment loss)
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Contract assets |  | $ | 19 |  |  | $ | (2 | ) |  | $ | 1 |
Trade notes and accounts receivable |  | $ | 805 |  |  | $ | (54 | ) |  | $ | 49 |
Other receivables |  | $ | 96 |  |  | $ | (69 | ) |  | $ | (5 | )
Inventories |  | $ | 365 |  |  | $ | 475 |  |  | $ | 1,161 |
Property, plant and equipment |  | $ | — |  |  | $ | 93 |  |  | $ | — |
Investment properties |  | $ | (19 | ) |  | $ | (57 | ) |  | $ | (27 | )
Intangible assets |  | $ | 51 |  |  | $ | 9 |  |  | $ | 9 |
Other assets |  | $ | — |  |  | $ | 44 |  |  | $ | — |
Depreciation and Amortization Expenses |
| f. | Depreciation and amortization expenses
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Property, plant and equipment |  | $ | 27,461 |  |  | $ | 26,930 |  |  | $ | 26,989 |
Right-of-use assets |  |  | — |  |  |  | 3,968 |  |  |  | 3,931 |
Investment properties |  |  | 21 |  |  |  | 25 |  |  |  | 22 |
Intangible assets |  |  | 4,386 |  |  |  | 4,253 |  |  |  | 5,424 |
Incremental costs of obtaining contracts |  |  | 1,941 |  |  |  | 1,173 |  |  |  | 772 |
Total depreciation and amortization expenses |  | $ | 33,809 |  |  | $ | 36,349 |  |  | $ | 37,138 |
Depreciation expenses summarized by functions |  |  |  |  |  |  |  |  |  |  |  |
Operating costs |  | $ | 25,996 |  |  | $ | 28,957 |  |  | $ | 29,056 |
Operating expenses |  |  | 1,486 |  |  |  | 1,966 |  |  |  | 1,886 |
|  | $ | 27,482 |  |  | $ | 30,923 |  |  | $ | 30,942 |
Amortization expenses summarized by functions |  |  |  |  |  |  |  |  |  |  |  |
Operating costs |  | $ | 6,085 |  |  | $ | 5,196 |  |  | $ | 5,971 |
Marketing expenses |  |  | 113 |  |  |  | 96 |  |  |  | 100 |
General and administrative expenses |  |  | 93 |  |  |  | 95 |  |  |  | 82 |
Research and development expenses |  |  | 36 |  |  |  | 39 |  |  |  | 43 |
|  | $ | 6,327 |  |  | $ | 5,426 |  |  | $ | 6,196 |
Employee Benefit Expenses |
| g. | Employee benefit expenses
|  | Year Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Post-employment benefit |  |  |  |  |  |  |  |  |  |  |  |
Defined contribution plans |  | $ | 640 |  |  | $ | 654 |  |  | $ | 708 |
Defined benefit plans |  |  | 2,953 |  |  |  | 2,859 |  |  |  | 2,001 |
|  |  | 3,593 |  |  |  | 3,513 |  |  |  | 2,709 |
Share-based payment |  |  |  |  |  |  |  |  |  |  |  |
Equity-settled share-based payment |  |  | 17 |  |  |  | 2 |  |  |  | 8 |
Other employee benefit |  |  |  |  |  |  |  |  |  |  |  |
Salaries |  |  | 26,204 |  |  |  | 25,464 |  |  |  | 26,630 |
Insurance |  |  | 2,740 |  |  |  | 2,746 |  |  |  | 2,712 |
Others |  |  | 14,470 |  |  |  | 14,430 |  |  |  | 12,904 |
|  |  | 43,414 |  |  |  | 42,640 |  |  |  | 42,246 |
Total employee benefit expenses |  | $ | 47,024 |  |  | $ | 46,155 |  |  | $ | 44,963 |
Summary by functions |  |  |  |  |  |  |  |  |  |  |  |
Operating costs |  | $ | 24,367 |  |  | $ | 23,587 |  |  | $ | 23,005 |
Operating expenses |  |  | 22,657 |  |  |  | 22,568 |  |  |  | 21,958 |
|  | $ | 47,024 |  |  | $ | 46,155 |  |  | $ | 44,963 |
The compensation to the employees and remuneration to the directors of 2018 and 2019 approved by the Board of Directors on March 19, 2019 and February 26, 2020, respectively, were as follows:
|  | 2018 |  |  | 2019 |
|  | Cash |  |  | Cash |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Compensation distributed to the employees |  | $ | 1,404 |  |  | $ | 1,126 |
Remuneration paid to the directors |  |  | 38 |  |  |  | 35 |

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