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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Statement [LineItems] |
Categories of Financial Instruments |
| a. | Categories of financial instruments
|  | December 31, 2019 |  |  | December 31, 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Financial assets |  |  |  |  |  |  |  |
FVTPL (Note 1) |  | $ | 326.8 |  |  | $ | 2,259.4 |
FVTOCI (Note 2) |  |  | 134,776.8 |  |  |  | 129,918.7 |
Hedging financial assets |  |  | 25.9 |  |  |  | 0.1 |
Amortized cost (Note 3) |  |  | 612,740.6 |  |  |  | 826,293.6 |
|  | $ | 747,870.1 |  |  | $ | 958,471.8 |
Financial liabilities |  |  |  |  |  |  |  |
FVTPL (Note 4) |  | $ | 982.3 |  |  | $ | 94.1 |
Hedging financial liabilities |  |  | 1.8 |  |  |  | 1.2 |
Amortized cost (Note 5) |  |  | 533,581.7 |  |  |  | 748,129.3 |
|  | $ | 534,565.8 |  |  | $ | 748,224.6 |
Note 1: |  | Financial assets mandatorily measured at FVTPL.
Note 2: |  | Including notes and accounts receivable (net), equity and debt investments.
Note 3: |  | Including cash and cash equivalents, financial assets at amortized cost, notes and accounts receivable (including related parties), other receivables and refundable deposits.
Note 4: |  | Held for trading.
Note 5: |  | Including short-term loans, accounts payable (including related parties), payables to contractors and equipment suppliers, cash dividends payable, accrued expenses and other current liabilities, bonds payable, long-term bank loans and guarantee deposits.
Summary of Current Credit Risk Assessment Policies | The Company assesses the 12-month expected credit loss and lifetime expected credit loss based on the probability of default and loss given default provided by external credit rating agencies. The current credit risk assessment policies are as follows:
Category |  | Description |  | Basis for Recognizing Expected Credit Loss |  | Expected Credit Loss Ratio
Performing |  | Credit rating is investment grade on valuation date |  | 12 months expected credit loss |  | 0—0.1%
Doubtful |  | Credit rating is non-investment grade on valuation date |  | Lifetime expected credit loss-not credit impaired |  | —
In default |  | Credit rating is CC or below on valuation date |  | Lifetime expected credit loss-credit impaired |  | —
Write-off |  | There is evidence indicating that the debtor is in severe financial difficulty and the Company has no realistic prospect of recovery |  | Amount is written off |  | —
Summary of Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments, Including Principal and Interest | The table below summarizes the maturity profile of the Company’s financial liabilities based on contractual undiscounted payments, including principal and interest.
|  | Less Than 1 Year |  |  | 1-3 Years |  |  | 3-5 Years |  |  | More Than 5 Years |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-derivative financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term loans |  | $ | 118,562.6 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 118,562.6 |
Accounts payable (including related parties) |  |  | 40,206.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 40,206.0 |
Payables to contractors and equipment suppliers |  |  | 140,810.7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 140,810.7 |
Accrued expenses and other current liabilities |  |  | 45,760.9 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 45,760.9 |
Bonds payable |  |  | 32,338.9 |  |  |  | 7,777.7 |  |  |  | 18,203.6 |  |  |  | — |  |  |  | 58,320.2 |
Lease liabilities (including those classified under accrued expenses and other current liabilities) |  |  | 2,475.1 |  |  |  | 2,782.9 |  |  |  | 2,484.5 |  |  |  | 10,947.7 |  |  |  | 18,690.2 |
Guarantee deposits (including those classified under accrued expenses and other current liabilities) |  |  | 1,553.0 |  |  |  | 121.0 |  |  |  | 55.5 |  |  |  | 0.4 |  |  |  | 1,729.9 |
|  |  | 381,707.2 |  |  |  | 10,681.6 |  |  |  | 20,743.6 |  |  |  | 10,948.1 |  |  |  | 424,080.5 |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outflows |  |  | 141,450.8 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 141,450.8 |
Inflows |  |  | (141,128.9 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (141,128.9 | )
|  |  | 321.9 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 321.9 |
|  | $ | 382,029.1 |  |  | $ | 10,681.6 |  |  | $ | 20,743.6 |  |  | $ | 10,948.1 |  |  | $ | 424,402.4 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-derivative financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term loans |  | $ | 88,557.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 88,557.5 |
Accounts payable (including related parties) |  |  | 41,095.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 41,095.0 |
Payables to contractors and equipment suppliers |  |  | 157,805.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 157,805.0 |
Accrued expenses and other current liabilities |  |  | 71,995.7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 71,995.7 |
Bonds payable |  |  | 5,328.0 |  |  |  | 27,631.6 |  |  |  | 59,986.8 |  |  |  | 207,152.1 |  |  |  | 300,098.5 |
Long-term bank loans |  |  | 8.0 |  |  |  | 847.4 |  |  |  | 1,170.9 |  |  |  | — |  |  |  | 2,026.3 |
Lease liabilities (including those classified under accrued expenses and other current liabilities) |  |  | 2,024.2 |  |  |  | 3,566.7 |  |  |  | 3,198.8 |  |  |  | 15,067.9 |  |  |  | 23,857.6 |
Guarantee deposits (including those classified under accrued expenses and other current liabilities) |  |  | 84.4 |  |  |  | 113.5 |  |  |  | 151.8 |  |  |  | 0.3 |  |  |  | 350.0 |
|  |  | 366,897.8 |  |  |  | 32,159.2 |  |  |  | 64,508.3 |  |  |  | 222,220.3 |  |  |  | 685,785.6 |
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outflows |  |  | 177,764.2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 177,764.2 |
Inflows |  |  | (181,458.0 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (181,458.0 | )
|  |  | (3,693.8 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,693.8 | )
|  | $ | 363,204.0 |  |  | $ | 32,159.2 |  |  | $ | 64,508.3 |  |  | $ | 222,220.3 |  |  | $ | 682,091.8 |
Summary of Additional Information About In Maturity Lease Liabilities | Information about the maturity analysis for lease liabilities more than 5 years:
|  | 5-10 Years |  |  | 10-15 Years |  |  | 15-20 Years |  |  | More Than 20 Years |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  | $ | 5,581.1 |  |  | $ | 3,691.3 |  |  | $ | 1,600.9 |  |  | $ | 74.4 |  |  | $ | 10,947.7 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  | $ | 7,402.0 |  |  | $ | 5,253.9 |  |  | $ | 2,255.2 |  |  | $ | 156.8 |  |  | $ | 15,067.9 |
Summary of Level 3 Fair Value Were Financial Assets at FVTPL and Equity Investments classified as Financial Assets at FVTOCI | The financial assets measured at Level 3 fair value were financial assets at FVTPL and equity investments classified as financial assets at FVTOCI. Reconciliations for the years ended December 31, 2018, 2019 and 2020 were as follows:
|  | Years Ended December 31 |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Balance, beginning of year |  | $ | 5,841.4 |  |  | $ | 3,910.7 |  |  | $ | 4,208.9 |
Additions |  |  | 212.5 |  |  |  | 372.3 |  |  |  | 175.2 |
Recognized in profit or loss |  |  | — |  |  |  | — |  |  |  | (3.8 | )
Recognized in other comprehensive income |  |  | (2,141.4 | ) |  |  | 129.5 |  |  |  | 409.0 |
Disposals and proceeds from return of capital of investments |  |  | (175.8 | ) |  |  | (76.5 | ) |  |  | (51.1 | )
Transfers out of level 3 (Note) |  |  | — |  |  |  | (43.6 | ) |  |  | — |
Effect of exchange rate changes |  |  | 174.0 |  |  |  | (83.5 | ) |  |  | (223.3 | )
Balance, end of year |  | $ | 3,910.7 |  |  | $ | 4,208.9 |  |  | $ | 4,514.9 |
Measured at fair value on a recurring basis [member] |
Statement [LineItems] |
Fair Value of Financial Instruments | The following table presents the Company’s financial assets and liabilities measured at fair value on a recurring basis:
|  | December 31, 2019 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Financial assets at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | — |  |  | $ | 162.1 |  |  | $ | — |  |  | $ | 162.1 |
Convertible bonds |  |  | — |  |  |  | — |  |  |  | 123.8 |  |  |  | 123.8 |
Agency mortgage-backed securities |  |  | — |  |  |  | 40.9 |  |  |  | — |  |  |  | 40.9 |
|  | $ | — |  |  | $ | 203.0 |  |  | $ | 123.8 |  |  | $ | 326.8 |
Financial assets at FVTOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in debt instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency bonds/Agency mortgage-backed securities |  | $ | — |  |  | $ | 51,966.5 |  |  | $ | — |  |  | $ | 51,966.5 |
Corporate bonds |  |  | — |  |  |  | 51,790.0 |  |  |  | — |  |  |  | 51,790.0 |
Government bonds |  |  | 12,678.1 |  |  |  | 146.1 |  |  |  | — |  |  |  | 12,824.2 |
Asset-backed securities |  |  | — |  |  |  | 10,815.9 |  |  |  | — |  |  |  | 10,815.9 |
Investments in equity instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-publicly traded equity investments |  |  | — |  |  |  | 39.2 |  |  |  | 4,085.1 |  |  |  | 4,124.3 |
Notes and accounts receivable, net |  |  | — |  |  |  | 3,255.9 |  |  |  | — |  |  |  | 3,255.9 |
|  | $ | 12,678.1 |  |  | $ | 118,013.6 |  |  | $ | 4,085.1 |  |  | $ | 134,776.8 |
Hedging financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate futures contracts |  | $ | 22.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 22.4 |
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange contracts |  |  | — |  |  |  | 3.5 |  |  |  | — |  |  |  | 3.5 |
|  | $ | 22.4 |  |  | $ | 3.5 |  |  | $ | — |  |  | $ | 25.9 |
Financial liabilities at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held for trading |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | — |  |  | $ | 982.3 |  |  | $ | — |  |  | $ | 982.3 |
Hedging financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | — |  |  | $ | 1.8 |  |  | $ | — |  |  | $ | 1.8 |
|  | December 31, 2020 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Financial assets at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | — |  |  | $ | 2,259.4 |  |  | $ | — |  |  | $ | 2,259.4 |
Financial assets at FVTOCI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in debt instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | — |  |  | $ | 56,593.6 |  |  | $ | — |  |  | $ | 56,593.6 |
Agency bonds/Agency mortgage-backed securities |  |  | — |  |  |  | 43,977.1 |  |  |  | — |  |  |  | 43,977.1 |
Government bonds |  |  | 13,279.2 |  |  |  | 180.3 |  |  |  | — |  |  |  | 13,459.5 |
Asset-backed securities |  |  | — |  |  |  | 8,368.3 |  |  |  | — |  |  |  | 8,368.3 |
Investments in equity instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-publicly traded equity investments |  |  | — |  |  |  | — |  |  |  | 4,514.9 |  |  |  | 4,514.9 |
Publicly traded stocks |  |  | 50.0 |  |  |  | — |  |  |  | — |  |  |  | 50.0 |
Notes and accounts receivable, net |  |  | — |  |  |  | 2,955.3 |  |  |  | — |  |  |  | 2,955.3 |
|  | $ | 13,329.2 |  |  | $ | 112,074.6 |  |  | $ | 4,514.9 |  |  | $ | 129,918.7 |
Hedging financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate futures contracts |  | $ | 0.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |
Financial liabilities at FVTPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held for trading |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | — |  |  | $ | 94.1 |  |  | $ | — |  |  | $ | 94.1 |
Hedging financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate futures contracts |  | $ | 1.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 1.2 |
Not measured at fair value but for which the fair value is disclosed [member] |
Statement [LineItems] |
Fair Value of Financial Instruments | The table below sets out the fair value hierarchy for the Company’s financial assets and liabilities which are not required to measure at fair value:
|  | December 31, 2019 |
|  | Carrying |  |  | Level 2 |
|  | Amount |  |  | Fair Value |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Financial assets |  |  |  |  |  |  |  |
Financial assets at amortized costs |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 7,648.8 |  |  | $ | 7,718.7 |
Financial liabilities |  |  |  |  |  |  |  |
Financial liabilities at amortized costs |  |  |  |  |  |  |  |
Bonds payable |  | $ | 56,900.0 |  |  | $ | 57,739.1 |
|  | December 31, 2020 |
|  | Carrying |  |  | Level 2 |
|  | Amount |  |  | Fair Value |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Financial assets |  |  |  |  |  |  |  |
Financial assets at amortized costs |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 10,970.2 |  |  | $ | 11,053.6 |
Financial liabilities |  |  |  |  |  |  |  |
Financial liabilities at amortized costs |  |  |  |  |  |  |  |
Bonds payable |  | $ | 256,705.1 |  |  | $ | 257,551.2 |

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