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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Property Plant And Equipment [Line Items] |
Summary of Property, Plant and Equipment |
|  | December 31 |
|  | 2018 |
|  | NT$ |
|  | (In Millions) |
Carrying amount |  |  |  |
Land |  | $ | 103,972 |
Land improvements |  |  | 263 |
Buildings |  |  | 44,784 |
Computer equipment |  |  | 2,115 |
Telecommunications equipment |  |  | 116,322 |
Transportation equipment |  |  | 231 |
Miscellaneous equipment |  |  | 2,582 |
Construction in progress and equipment to be accepted |  |  | 18,645 |
|  | $ | 288,914 |
|  | Land |  |  | Land Improvements |  |  | Buildings |  |  | Computer Equipment |  |  | Telecommuni- cations Equipment |  |  | Transportation Equipment |  |  | Miscellaneous Equipment |  |  | Construction in Progress and Equipment to be Accepted |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2017 |  | $ | 103,872 |  |  | $ | 1,581 |  |  | $ | 67,738 |  |  | $ | 14,295 |  |  | $ | 715,692 |  |  | $ | 3,866 |  |  | $ | 8,943 |  |  | $ | 20,141 |  |  | $ | 936,128 |
Additions |  |  | — |  |  |  | — |  |  |  | 30 |  |  |  | 78 |  |  |  | 193 |  |  |  | 1 |  |  |  | 193 |  |  |  | 25,574 |  |  |  | 26,069 |
Disposal |  |  | (158 | ) |  |  | (5 | ) |  |  | (108 | ) |  |  | (974 | ) |  |  | (13,739 | ) |  |  | (62 | ) |  |  | (402 | ) |  |  | — |  |  |  | (15,448 | )
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (172 | ) |  |  | — |  |  |  | (3 | ) |  |  | — |  |  |  | (176 | )
Others |  |  | 365 |  |  |  | 19 |  |  |  | 5,034 |  |  |  | 764 |  |  |  | 20,080 |  |  |  | 29 |  |  |  | 784 |  |  |  | (27,188 | ) |  |  | (113 | )
Balance on December 31, 2017 |  | $ | 104,079 |  |  | $ | 1,595 |  |  | $ | 72,694 |  |  | $ | 14,162 |  |  | $ | 722,054 |  |  | $ | 3,834 |  |  | $ | 9,515 |  |  | $ | 18,527 |  |  | $ | 946,460 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2017 |  | $ | — |  |  | $ | (1,248 | ) |  | $ | (25,591 | ) |  | $ | (11,582 | ) |  | $ | (596,497 | ) |  | $ | (3,237 | ) |  | $ | (6,803 | ) |  | $ | — |  |  | $ | (644,958 | )
Depreciation expenses |  |  | — |  |  |  | (50 | ) |  |  | (1,402 | ) |  |  | (1,192 | ) |  |  | (24,492 | ) |  |  | (330 | ) |  |  | (677 | ) |  |  | — |  |  |  | (28,143 | )
Disposal |  |  | — |  |  |  | 4 |  |  |  | 47 |  |  |  | 967 |  |  |  | 13,712 |  |  |  | 63 |  |  |  | 389 |  |  |  | — |  |  |  | 15,182 |
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 45 |  |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | 47 |
Others |  |  | — |  |  |  | 1 |  |  |  | 147 |  |  |  | 19 |  |  |  | 78 |  |  |  | (9 | ) |  |  | (116 | ) |  |  | — |  |  |  | 120 |
Balance on December 31, 2017 |  | $ | — |  |  | $ | (1,293 | ) |  | $ | (26,799 | ) |  | $ | (11,788 | ) |  | $ | (607,154 | ) |  | $ | (3,513 | ) |  | $ | (7,205 | ) |  | $ | — |  |  | $ | (657,752 | )
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2018 |  | $ | 104,079 |  |  | $ | 1,595 |  |  | $ | 72,694 |  |  | $ | 14,162 |  |  | $ | 722,054 |  |  | $ | 3,834 |  |  | $ | 9,515 |  |  | $ | 18,527 |  |  | $ | 946,460 |
Additions |  |  | — |  |  |  | — |  |  |  | 21 |  |  |  | 52 |  |  |  | 159 |  |  |  | — |  |  |  | 334 |  |  |  | 27,413 |  |  |  | 27,979 |
Disposal |  |  | (71 | ) |  |  | — |  |  |  | — |  |  |  | (643 | ) |  |  | (31,984 | ) |  |  | (29 | ) |  |  | (623 | ) |  |  | — |  |  |  | (33,350 | )
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 60 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 60 |
Others |  |  | (36 | ) |  |  | 6 |  |  |  | 196 |  |  |  | 687 |  |  |  | 25,459 |  |  |  | 77 |  |  |  | 648 |  |  |  | (27,295 | ) |  |  | (258 | )
Balance on December 31, 2018 |  | $ | 103,972 |  |  | $ | 1,601 |  |  | $ | 72,911 |  |  | $ | 14,258 |  |  | $ | 715,748 |  |  | $ | 3,882 |  |  | $ | 9,874 |  |  | $ | 18,645 |  |  | $ | 940,891 |
(Continued)
|  | Land |  |  | Land Improvements |  |  | Buildings |  |  | Computer Equipment |  |  | Telecommuni- cations Equipment |  |  | Transportation Equipment |  |  | Miscellaneous Equipment |  |  | Construction in Progress and Equipment to be Accepted |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2018 |  | $ | — |  |  | $ | (1,293 | ) |  | $ | (26,799 | ) |  | $ | (11,788 | ) |  | $ | (607,154 | ) |  | $ | (3,513 | ) |  | $ | (7,205 | ) |  | $ | — |  |  | $ | (657,752 | )
Depreciation expenses |  |  | — |  |  |  | (45 | ) |  |  | (1,356 | ) |  |  | (983 | ) |  |  | (24,236 | ) |  |  | (162 | ) |  |  | (679 | ) |  |  | — |  |  |  | (27,461 | )
Disposal |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 632 |  |  |  | 31,952 |  |  |  | 29 |  |  |  | 615 |  |  |  | — |  |  |  | 33,228 |
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (20 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (20 | )
Others |  |  | — |  |  |  | — |  |  |  | 28 |  |  |  | (4 | ) |  |  | 32 |  |  |  | (5 | ) |  |  | (23 | ) |  |  | — |  |  |  | 28 |
Balance on December 31, 2018 |  | $ | — |  |  | $ | (1,338 | ) |  | $ | (28,127 | ) |  | $ | (12,143 | ) |  | $ | (599,426 | ) |  | $ | (3,651 | ) |  | $ | (7,292 | ) |  | $ | — |  |  | $ | (651,977 | )
Disclosure Of Property Plant And Equipment Estimated Useful Life Explanatory | Depreciation expense in 2017 and 2018 is computed using the straight-line method over the following estimated service lives:
Land improvements |  | 8-30 years
Buildings |  |
Main buildings |  | 35-60 years
Other building facilities |  | 3-20 years
Computer equipment |  | 2-8 years
Telecommunications equipment |  |
Telecommunication circuits |  | 2-30 years
Telecommunication machinery and antennas equipment |  | 2-30 years
Transportation equipment |  | 3-10 years
Miscellaneous equipment |  |
Leasehold improvements |  | 1-6 years
Mechanical and air conditioner equipment |  | 3-16 years
Others |  | 1-10 years
Summary of Assets Used by the Company |
|  | December 31, 2019 |
|  | NT$ |
|  | (In Millions) |
Assets used by the Company |  | $ | 276,370 |
Assets subject to operating leases |  |  | 7,324 |
|  | $ | 283,694 |
Summary of Future Aggregate Lease Collection under Operating Lease for Freehold Plant, Property and Equipment | The future aggregate minimum lease payments under non-cancellable operating leases are as follows: 2018
|  | December 31, 2018 |
|  | NT$ |
|  | (In Millions) |
Within one year |  | $ | 3,439 |
Longer than one year but within five years |  |  | 6,375 |
Longer than five years |  |  | 744 |
|  | $ | 10,558 |
The future aggregate minimum lease collection under non-cancellable operating leases is as follows:
|  | December 31, 2018 |
|  | NT$ |
|  | (In Millions) |
Within one year |  | $ | 344 |
Longer than one year but within five years |  |  | 580 |
Longer than five years |  |  | 206 |
|  | $ | 1,130 |
2019 The future aggregate lease collection under operating lease for investment properties is as follows:
|  | December 31, 2019 |
|  | NT$ |
|  | (In Millions) |
Year 1 |  | $ | 113 |
Year 2 |  |  | 91 |
Year 3 |  |  | 71 |
Year 4 |  |  | 61 |
Year 5 |  |  | 39 |
Onwards |  |  | 96 |
|  | $ | 471 |
Assets Subject to Operating Leases [Member] |
Disclosure Of Property Plant And Equipment [Line Items] |
Summary of Property, Plant and Equipment |
|  | Land |  |  | Land Improvements |  |  | Buildings |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2019 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Effect of retrospective application of IFRS 16 |  |  | 3,617 |  |  |  | 1 |  |  |  | 3,583 |  |  |  | 7,201 |
Balance on January 1, 2019 as adjusted |  |  | 3,617 |  |  |  | 1 |  |  |  | 3,583 |  |  |  | 7,201 |
Additions |  |  | — |  |  |  | — |  |  |  | 4 |  |  |  | 4 |
Transferred from (to) assets used by the Company |  |  | 1,362 |  |  |  | (1 | ) |  |  | 255 |  |  |  | 1,616 |
Balance on December 31, 2019 |  | $ | 4,979 |  |  | $ | — |  |  | $ | 3,842 |  |  | $ | 8,821 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2019 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Effect of retrospective application of IFRS 16 |  |  | — |  |  |  | (1 | ) |  |  | (1,265 | ) |  |  | (1,266 | )
Balance on January 1, 2019 as adjusted |  |  | — |  |  |  | (1 | ) |  |  | (1,265 | ) |  |  | (1,266 | )
Depreciation expenses |  |  | — |  |  |  | — |  |  |  | (74 | ) |  |  | (74 | )
Transferred to (from) assets used by the company |  |  | — |  |  |  | 1 |  |  |  | (158 | ) |  |  | (157 | )
Balance on December 31, 2019 |  | $ | — |  |  | $ | — |  |  | $ | (1,497 | ) |  | $ | (1,497 | )
Balance on January 1, 2019 as adjusted, net |  | $ | 3,617 |  |  | $ | — |  |  | $ | 2,318 |  |  | $ | 5,935 |
Balance on December 31, 2019, net |  | $ | 4,979 |  |  | $ | — |  |  | $ | 2,345 |  |  | $ | 7,324 |
Disclosure Of Property Plant And Equipment Estimated Useful Life Explanatory | The above items of property, plant and equipment subject to operating leases are depreciated on a straight-line basis over their estimated useful lives as follows:
Land improvements |  | 10 years
Buildings |  |
Main buildings |  | 35-60 years
Other building facilities |  | 3-15 years
Summary of Future Aggregate Lease Collection under Operating Lease for Freehold Plant, Property and Equipment | The future aggregate lease collection under operating lease for the freehold plant, property and equipment is as follows:
|  | December 31, 2019 |
|  | NT$ |
|  | (In Millions) |
Year 1 |  | $ | 302 |
Year 2 |  |  | 273 |
Year 3 |  |  | 234 |
Year 4 |  |  | 191 |
Year 5 |  |  | 130 |
Onwards |  |  | 1,224 |
|  | $ | 2,354 |
Assets Used by the Company [Member] |
Disclosure Of Property Plant And Equipment [Line Items] |
Summary of Property, Plant and Equipment |
|  | Land |  |  | Land Improvements |  |  | Buildings |  |  | Computer Equipment |  |  | Telecommuni- cations Equipment |  |  | Transportation Equipment |  |  | Miscellaneous Equipment |  |  | Construction in Progress and Equipment to be Accepted |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2019 |  | $ | 103,972 |  |  | $ | 1,601 |  |  | $ | 72,911 |  |  | $ | 14,258 |  |  | $ | 715,748 |  |  | $ | 3,882 |  |  | $ | 9,874 |  |  | $ | 18,645 |  |  | $ | 940,891 |
Effect of retrospective application of IFRS 16 |  |  | (3,617 | ) |  |  | (1 | ) |  |  | (3,583 | ) |  |  | — |  |  |  | (3,885 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (11,086 | )
Balance on January 1, 2019 as adjusted |  |  | 100,355 |  |  |  | 1,600 |  |  |  | 69,328 |  |  |  | 14,258 |  |  |  | 711,863 |  |  |  | 3,882 |  |  |  | 9,874 |  |  |  | 18,645 |  |  |  | 929,805 |
Additions |  |  | — |  |  |  | — |  |  |  | 1,221 |  |  |  | 57 |  |  |  | 120 |  |  |  | 1 |  |  |  | 149 |  |  |  | 21,612 |  |  |  | 23,160 |
Disposal |  |  | (38 | ) |  |  | (7 | ) |  |  | (3 | ) |  |  | (1,916 | ) |  |  | (30,417 | ) |  |  | (51 | ) |  |  | (405 | ) |  |  | — |  |  |  | (32,837 | )
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (37 | ) |  |  | — |  |  |  | (1 | ) |  |  | (6 | ) |  |  | (44 | )
Others |  |  | (1,214 | ) |  |  | 25 |  |  |  | 455 |  |  |  | 606 |  |  |  | 24,503 |  |  |  | 80 |  |  |  | 473 |  |  |  | (26,499 | ) |  |  | (1,571 | )
Balance on December 31, 2019 |  | $ | 99,103 |  |  | $ | 1,618 |  |  | $ | 71,001 |  |  | $ | 13,005 |  |  | $ | 706,032 |  |  | $ | 3,912 |  |  | $ | 10,090 |  |  | $ | 13,752 |  |  | $ | 918,513 |
Accumulated depreciation and impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance on January 1, 2019 |  | $ | — |  |  | $ | (1,338 | ) |  | $ | (28,127 | ) |  | $ | (12,143 | ) |  | $ | (599,426 | ) |  | $ | (3,651 | ) |  | $ | (7,292 | ) |  | $ | — |  |  | $ | (651,977 | )
Effect of retrospective application of IFRS 16 |  |  | — |  |  |  | 1 |  |  |  | 1,265 |  |  |  | — |  |  |  | 2,576 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,842 |
Balance on January 1, 2019 as adjusted |  |  | — |  |  |  | (1,337 | ) |  |  | (26,862 | ) |  |  | (12,143 | ) |  |  | (596,850 | ) |  |  | (3,651 | ) |  |  | (7,292 | ) |  |  | — |  |  |  | (648,135 | )
Depreciation expenses |  |  | — |  |  |  | (43 | ) |  |  | (1,301 | ) |  |  | (827 | ) |  |  | (23,906 | ) |  |  | (91 | ) |  |  | (688 | ) |  |  | — |  |  |  | (26,856 | )
Disposal |  |  | — |  |  |  | 6 |  |  |  | 3 |  |  |  | 1,909 |  |  |  | 30,380 |  |  |  | 51 |  |  |  | 402 |  |  |  | — |  |  |  | 32,751 |
Impairment losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (64 | ) |  |  | (29 | ) |  |  | (93 | )
Effect of foreign exchange differences |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 16 |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | 17 |
Others |  |  | — |  |  |  | (1 | ) |  |  | 183 |  |  |  | (7 | ) |  |  | 22 |  |  |  | (3 | ) |  |  | (21 | ) |  |  | — |  |  |  | 173 |
Balance on December 31, 2019 |  | $ | — |  |  | $ | (1,375 | ) |  | $ | (27,977 | ) |  | $ | (11,068 | ) |  | $ | (590,338 | ) |  | $ | (3,694 | ) |  | $ | (7,662 | ) |  | $ | (29 | ) |  | $ | (642,143 | )
Disclosure Of Property Plant And Equipment Estimated Useful Life Explanatory | Depreciation expense for assets used by the Company in 2019 is computed using the straight-line method over the following estimated service lives:
Land improvements |  | 10-30 years
Buildings |  |
Main buildings |  | 20-60 years
Other building facilities |  | 3-15 years
Computer equipment |  | 2-8 years
Telecommunications equipment |  |
Telecommunication circuits |  | 2-30 years
Telecommunication machinery and antennas equipment |  | 2-30 years
Transportation equipment |  | 3-10 years
Miscellaneous equipment |  |
Leasehold improvements |  | 1-9 years
Mechanical and air conditioner equipment |  | 3-16 years
Others |  | 1-15 years

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