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Cash and Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash And Cash Equivalents [Abstract] |
Summary of Cash and Cash Equivalents |
|  | December 31 |
|  | 2017 |  |  | 2018 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Cash |  |  |  |  |  |  |  |
Cash on hand |  | $ | 383 |  |  | $ | 463 |
Bank deposits |  |  | 7,877 |  |  |  | 10,575 |
|  |  | 8,260 |  |  |  | 11,038 |
Cash equivalents (investments with maturities of less than three months) |  |  |  |  |  |  |  |
Commercial paper |  | $ | 10,179 |  |  | $ | 6,144 |
Negotiable certificate of deposit |  |  | 7,950 |  |  |  | 7,600 |
Time deposits |  |  | 2,436 |  |  |  | 2,863 |
|  |  | 20,565 |  |  |  | 16,607 |
|  | $ | 28,825 |  |  | $ | 27,645 |
Annual Yield Rates of Bank Deposits, Commercial Paper, Negotiable Certificates of Deposit and Time Deposits | The annual yield rates of bank deposits, commercial paper, negotiable certificates of deposit and time deposits as of balance sheet dates were as follows:
|  | December 31
|  | 2017 |  | 2018
Bank deposits |  | 0.00%-0.70% |  | 0.00%-0.50%
Commercial paper |  | 0.32%-0.40% |  | 0.47%-0.57%
Negotiable certificate of deposit |  | 0.40%-0.50% |  | 0.55%-0.60%
Time deposits |  | 0.52%-4.40% |  | 0.09%-4.40%

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