XML 67 R54.htm IDEA: XBRL DOCUMENT
v3.19.1

Financial Assets at Fair Value Through Other Comprehensive Income-2018 (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Text block [abstract] |
Summary of Financial Assets at Fair Value through Other Comprehensive Income |
|  | December 31, 2018 |
|  | NT$ |
|  | (In Millions) |
Investments in debt instruments at FVTOCI |  |  |  |
Corporate bonds |  | $ | 40,753.6 |
Agency bonds/Agency mortgage-backed securities |  |  | 31,288.8 |
Asset-backed securities |  |  | 15,670.3 |
Government bonds |  |  | 11,151.3 |
Commercial paper |  |  | 107.6 |
|  |  | 98,971.6 |
Investments in equity instruments at FVTOCI |  |  |  |
Non-publicly traded equity investments |  |  | 3,910.7 |
Publicly traded stocks |  |  | 590.1 |
|  |  | 4,500.8 |
|  | $ | 103,472.4 |
Current |  | $ | 99,561.7 |
Noncurrent |  |  | 3,910.7 |
|  | $ | 103,472.4 |

X
- Definition Disclosure of detailed information about financial instruments at fair value through other comprehensive income. + References No definition available. + Details
Name: | tsm_DisclosureOfDetailedInformationAboutFinancialInstrumentsAtFairValueThroughOtherComprehensiveIncomeExplanatory
Namespace Prefix: | tsm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Text block [abstract] + References No definition available. + Details
Name: | tsm_TextBlockAbstract
Namespace Prefix: | tsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration