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Consolidated Statements of Comprehensive Income
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
TWD ($)
$ / shares
Dec. 31, 2016
TWD ($)
$ / shares
Statement [LineItems]        
REVENUES $ 215,483 $ 7,040 $ 227,514 $ 229,991
OPERATING COSTS 139,545 4,559 146,837 147,552
GROSS PROFIT 75,938 2,481 80,677 82,439
OPERATING EXPENSES        
Marketing 23,170 757 25,357 25,516
General and administrative 4,589 150 4,626 4,537
Research and development 3,725 122 3,886 3,785
Expected credit loss 920 30 0 0
Total operating expenses 32,404 1,059 33,869 33,838
OTHER INCOME AND EXPENSES 110 4 (105) (496)
INCOME FROM OPERATIONS 43,644 1,426 46,703 48,105
NON-OPERATING INCOME AND EXPENSES        
Interest income 197 7 205 189
Other income 700 23 836 1,072
Other gains and losses (46) (2) (132) (448)
Interest expenses (18) (1) (22) (20)
Share of the profits of associates and joint ventures accounted for using equity method 509 17 419 515
Total non-operating income and expenses 1,342 44 1,306 1,308
INCOME BEFORE INCOME TAX 44,986 1,470 48,009 49,413
INCOME TAX EXPENSE 6,405 210 7,849 7,787
NET INCOME 38,581 1,260 40,160 41,626
Items that will not be reclassified to profit or loss:        
Remeasurements of defined benefit pension plans (1,215) (40) (2,024) (2,043)
Unrealized gain or loss on investments in equity instruments at fair value through other comprehensive income (346) (11) 0 0
Gain or loss on hedging instruments subject to basis adjustment 2 0 0 0
Share of remeasurements of defined benefit pension plans of associates and joint ventures 2 0 1 (44)
Income tax benefit relating to items that will not be reclassified to profit or loss 450 15 344 347
Items that will not be reclassified to profit or loss (1,107) (36) (1,679) (1,740)
Items that may be reclassified subsequently to profit or loss:        
Exchange differences arising from the translation of the foreign operations 90 3 (229) (170)
Unrealized gain or loss on available-for- sale financial assets 0 0 605 (144)
Cash flow hedges 0 0 (1) (1)
Share of exchange differences arising from the translation of the foreign operations of associates and joint ventures 3 0 (5) (3)
Income tax benefit relating to items that may be reclassified subsequently 0 0 3 2
Items that may be reclassified subsequently to profit or loss 93 3 373 (316)
Total other comprehensive loss, net of income tax (1,014) (33) (1,306) (2,056)
TOTAL COMPREHENSIVE INCOME 37,567 1,227 38,854 39,570
NET INCOME ATTRIBUTABLE TO        
Stockholders of the parent 37,557 1,227 38,988 40,485
Noncontrolling interests 1,024 33 1,172 1,141
NET INCOME 38,581 1,260 40,160 41,626
COMPREHENSIVE INCOME ATTRIBUTABLE TO        
Stockholders of the parent 36,552 1,194 37,705 38,486
Noncontrolling interests 1,015 33 1,149 1,084
TOTAL COMPREHENSIVE INCOME $ 37,567 $ 1,227 $ 38,854 $ 39,570
EARNINGS PER SHARE        
Basic | (per share) $ 4.84 $ 0.16 $ 5.03 $ 5.22
Diluted | (per share) 4.83 0.16 5.02 5.21
American Depositary Shares [Member]        
EARNINGS PER SHARE        
Basic | (per share) 48.41 1.58 50.26 52.19
Diluted | (per share) $ 48.35 $ 1.58 $ 50.19 $ 52.11