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Consolidated Statements of Comprehensive Income
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
TWD ($)
$ / shares
Dec. 31, 2015
TWD ($)
$ / shares
Statement [LineItems]        
REVENUES $ 227,514 $ 7,676 $ 229,991 $ 231,795
OPERATING COSTS 146,837 4,954 147,552 148,126
GROSS PROFIT 80,677 2,722 82,439 83,669
OPERATING EXPENSES        
Marketing 25,357 856 25,516 25,071
General and administrative 4,626 156 4,537 4,515
Research and development 3,886 131 3,785 3,617
Total operating expenses 33,869 1,143 33,838 33,203
OTHER INCOME AND EXPENSES (105) (3) (496) (105)
INCOME FROM OPERATIONS 46,703 1,576 48,105 50,361
NON-OPERATING INCOME AND EXPENSES        
Interest income 205 7 189 306
Other income 836 28 1,072 650
Other gains and losses (132) (4) (448) (228)
Interest expenses (22) (1) (20) (33)
Share of the profits of associates and joint ventures accounted for using equity method 419 14 515 897
Total non-operating income and expenses 1,306 44 1,308 1,592
INCOME BEFORE INCOME TAX 48,009 1,620 49,413 51,953
INCOME TAX EXPENSE 7,849 265 7,787 9,101
NET INCOME 40,160 1,355 41,626 42,852
Items that will not be reclassified to profit or loss:        
Remeasurements of defined benefit pension plans (2,024) (68) (2,043) (231)
Share of remeasurements of defined benefit pension plans of associates and joint ventures 1 0 (44) (25)
Income tax benefit relating to items that will not be reclassified to profit or loss 344 11 347 39
Items that will not be reclassified to profit or loss (1,679) (57) (1,740) (217)
Items that may be reclassified subsequently to profit or loss:        
Exchange differences arising from the translation of the foreign operations (229) (8) (170) 24
Unrealized gain (loss) on available-for- sale financial assets 605 21 (144) (645)
Cash flow hedges (1) 0 (1) 1
Share of exchange differences arising from the translation of the foreign operations of associates and joint ventures (5) 0 (3) 6
Income tax benefit (expense) relating to items that may be reclassified subsequently 3 0 2 (2)
Items that may be reclassified subsequently to profit or loss 373 13 (316) (616)
Total other comprehensive income (loss), net of income tax (1,306) (44) (2,056) (833)
TOTAL COMPREHENSIVE INCOME 38,854 1,311 39,570 42,019
NET INCOME ATTRIBUTABLE TO        
Stockholders of the parent 38,988 1,315 40,485 42,039
Noncontrolling interests 1,172 40 1,141 813
NET INCOME 40,160 1,355 41,626 42,852
COMPREHENSIVE INCOME ATTRIBUTABLE TO        
Stockholders of the parent 37,705 1,272 38,486 41,207
Noncontrolling interests 1,149 39 1,084 812
TOTAL COMPREHENSIVE INCOME $ 38,854 $ 1,311 $ 39,570 $ 42,019
EARNINGS PER SHARE        
Basic | (per share) $ 5.03 $ 0.17 $ 5.22 $ 5.42
Diluted | (per share) 5.02 0.17 5.21 5.41
American Depositary Shares [Member]        
EARNINGS PER SHARE        
Basic | (per share) 50.26 1.70 52.19 54.19
Diluted | (per share) $ 50.19 $ 1.69 $ 52.11 $ 54.06