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Subsidiaries - Detailed Information of Equity Transactions (Detail) - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
CHIEF Share-Based Payment [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Cash consideration received from noncontrolling interests | $ 14 | $ 8 | $ 39
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests | (10) | (2) | (17)
Differences arising from equity transactions | 4 | 6 | 22
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition | 0 | 0 |
Additional paid-in capital - arising from changes in equities of subsidiaries | 4 | 6 | 22
CHTSC Share-Based Payment [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Cash consideration received from noncontrolling interests | 14 | 15 | 35
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests | (14) | (13) | (30)
Differences arising from equity transactions | 0 | 2 | 5
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition | 0 | 0 |
Additional paid-in capital - arising from changes in equities of subsidiaries | 0 | 2 | 5
Chunghwa Not Proportionately Participating in the Capital Increase of CHST[Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Cash consideration received from noncontrolling interests |  |  | 15
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests |  |  | (10)
Differences arising from equity transactions |  |  | 5
Additional paid-in capital - arising from changes in equities of subsidiaries |  |  | $ 5
CLPT Share Based Payment [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Cash consideration received from noncontrolling interests | 9 | 1 |
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests | (13) | (1) |
Differences arising from equity transactions | (4) | 0 |
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition | 0 | 0 |
Additional paid-in capital - arising from changes in equities of subsidiaries | (4) | 0 |
Purchasing UTC Shares [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Cash consideration received from noncontrolling interests |  | 0 |
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests |  | 0 |
Differences arising from equity transactions |  | 0 |
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition |  | 0 |
Additional paid-in capital - arising from changes in equities of subsidiaries |  | $ 0 |
Disposal of CHTSC Shares [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Cash consideration received from noncontrolling interests | 207 |  |
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests | (19) |  |
Differences arising from equity transactions | 188 |  |
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition | 188 |  |
Additional paid-in capital - arising from changes in equities of subsidiaries | 0 |  |
Disposal of IISI Shares [Member] |  |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |  |
Cash consideration received from noncontrolling interests | 52 |  |
The proportionate share of the carrying amount of the net assets of the subsidiary transferred to noncontrolling interests | (16) |  |
Differences arising from equity transactions | 36 |  |
Additional paid-in capital arising from the difference between the consideration received or paid and the carrying amount of the subsidiaries net assets during actual disposal or acquisition | 36 |  |
Additional paid-in capital - arising from changes in equities of subsidiaries | $ 0 |  |

X
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