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Cash and Cash Equivalents (Tables)
 12 Months Ended
Dec. 31, 2017
Cash And Cash Equivalents [Abstract]  
Summary of Cash and Cash Equivalents

 

 

 

December 31

 

 

 

2016

 

 

2017

 

 

 

NT$

 

 

NT$

 

 

 

(In Millions)

 

Cash

 

 

 

 

 

 

 

 

Cash on hand

 

$

370

 

 

$

383

 

Bank deposits

 

 

7,240

 

 

 

7,877

 

 

 

 

7,610

 

 

 

8,260

 

Cash equivalents (investments with maturities of less

   than three months)

 

 

 

 

 

 

 

 

Commercial paper

 

$

11,436

 

 

$

10,179

 

Negotiable certificate of deposit

 

 

10,800

 

 

 

7,950

 

Time deposits

 

 

1,254

 

 

 

2,436

 

 

 

 

23,490

 

 

 

20,565

 

 

 

$

31,100

 

 

$

28,825

 

 
Annual Yield Rates of Bank Deposits, Commercial Paper, Negotiable Certificate of Deposit and Time Deposits

The annual yield rates of bank deposits, commercial paper, negotiable certificate of deposit and time deposits as of balance sheet dates were as follows:

 

 

 

December 31

 

 

2016

 

2017

Bank deposits

 

0.00%-0.42%

 

0.00%-0.70%

Commercial paper

 

0.32%-0.42%

 

0.32%-0.40%

Negotiable certificate of deposit

 

0.35%-0.50%

 

0.40%-0.50%

Time deposits

 

0.40%-3.30%

 

0.52%-4.40%