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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2021
Text Block [Abstract] |
Summary of Significant Transactions between the Company and Other Related Parties |
| b. | Net revenue
|  |  |  | Years Ended December 31 |
|  |  |  | 2019 |  |  | 2020 |  |  | 2021 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |
Net revenue from sale of goods |  | Associates |  | $ | 6,253.9 |  |  | $ | 8,129.8 |  |  | $ | 8,475.9 |
| c. | Purchases
|  |  |  | Years Ended December 31 |
|  |  |  | 2019 |  |  | 2020 |  |  | 2021 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |  |  |
Associates |  |  |  | $ | 6,301.4 |  |  | $ | 7,606.4 |  |  | $ | 7,569.8 |
| d. | Receivables from related parties
|  |  |  | December 31, 2020 |  |  | December 31, 2021 |
|  |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Name/Categories |  |  |  |  |  |  |  |
Receivables from related |  | GUC |  | $ | 370.6 |  |  | $ | 597.8 |
parties |  | Xintec |  |  | 187.5 |  |  |  | 117.5 |
|  |  |  | $ | 558.1 |  |  | $ | 715.3 |
Other receivables from related |  | SSMC |  | $ | 45.3 |  |  | $ | 50.4 |
parties |  | VIS |  |  | 4.3 |  |  |  | 11.1 |
|  | Other associates |  |  | 1.0 |  |  |  | — |
|  |  |  | $ | 50.6 |  |  | $ | 61.5 |
| e. | Payables to related parties
|  |  |  | December 31, 2020 |  |  | December 31, 2021 |
|  |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Name/Categories |  |  |  |  |  |  |  |
Payables to related parties |  | Xintec |  | $ | 1,358.6 |  |  | $ | 725.3 |
|  | VIS |  |  | 311.4 |  |  |  | 357.2 |
|  | SSMC |  |  | 400.8 |  |  |  | 349.2 |
|  | Other associates |  |  | 36.9 |  |  |  | 5.5 |
|  |  |  | $ | 2,107.7 |  |  | $ | 1,437.2 |
| f. | Accrued expenses and other current liabilities
|  |  |  | December 31, 2020 |  |  | December 31, 2021 |
|  |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Categories |  |  |  |  |  |  |  |
Contract liabilities |  | Associates |  | $ | — |  |  | $ | 726.4 |
| g. | Others
|  |  |  | Years Ended December 31 |
|  |  |  | 2019 |  |  | 2020 |  |  | 2021 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing expenses |  | Associates |  | $ | 2,823.0 |  |  | $ | 5,440.0 |  |  | $ | 5,459.9 |
Compensation to Directors and Other Key Management Personnel | The compensation to directors and other key management personnel were as follows:
|  |  |  | Years Ended December 31 |
|  |  |  | 2019 |  |  | 2020 |  |  | 2021 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Short-term employee benefits |  |  |  | $ | 1,922.2 |  |  | $ | 2,666.7 |  |  | $ | 2,886.8 |
Post-employment benefits |  |  |  |  | 2.7 |  |  |  | 2.3 |  |  |  | 2.9 |
|  |  |  | $ | 1,924.9 |  |  | $ | 2,669.0 |  |  | $ | 2,889.7 |

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