| a. | Categories of financial instruments |
| December 31, 2016 |
December 31, 2017 |
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| NT$ | NT$ | |||||||
| (In Millions) | (In Millions) | |||||||
|
Financial assets |
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|
FVTPL (Note 1) |
$ | 6,451.1 | $ | 569.8 | ||||
|
Available-for-sale financial assets |
71,891.3 | 98,248.5 | ||||||
|
Held-to-maturity financial assets |
38,917.7 | 20,821.7 | ||||||
|
Hedging derivative financial assets |
5.6 | 34.4 | ||||||
|
Loans and receivables (Note 2) |
673,592.9 | 684,416.6 | ||||||
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| $ | 790,858.6 | $ | 804,091.0 | |||||
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Financial liabilities |
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|
FVTPL (Note 1) |
$ | 191.1 | $ | 26.7 | ||||
|
Hedging derivative financial liabilities |
— | 15.6 | ||||||
|
Amortized cost (Note 3) |
387,046.2 | 340,501.2 | ||||||
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| $ | 387,237.3 | $ | 340,543.5 | |||||
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| Note 1: | Including held for trading and designated as at FVTPL. | |
| Note 2: | Including cash and cash equivalents, notes and accounts receivable (including related parties), other receivables and refundable deposits. | |
| Note 3: | Including short-term loans, accounts payable (including related parties), payables to contractors and equipment suppliers, accrued expenses and other current liabilities, bonds payable, long-term bank loans, and guarantee deposits. |