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Consolidated Statements of Comprehensive Income
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
TWD ($)
$ / shares
Dec. 31, 2018
TWD ($)
$ / shares
Statement [LineItems]        
REVENUES $ 207,609 $ 7,393 $ 207,520 $ 215,483
OPERATING COSTS 137,029 4,880 135,953 139,545
GROSS PROFIT 70,580 2,513 71,567 75,938
OPERATING EXPENSES        
Marketing 20,913 745 22,220 23,170
General and administrative 5,006 178 4,758 4,589
Research and development 3,850 137 3,941 3,725
Expected credit loss (reversal of credit loss) 45 2 (125) 920
Total operating expenses 29,814 1,062 30,794 32,404
OTHER INCOME AND EXPENSES 1,595 57 (127) 110
INCOME FROM OPERATIONS 42,361 1,508 40,646 43,644
NON-OPERATING INCOME AND EXPENSES        
Interest income 116 4 251 197
Other income 470 17 531 700
Other gains and losses (159) (6) 84 (46)
Interest expenses (206) (7) (104) (18)
Share of profits of associates and joint ventures accounted for using equity method 244 9 459 509
Total non-operating income and expenses 465 17 1,221 1,342
INCOME BEFORE INCOME TAX 42,826 1,525 41,867 44,986
INCOME TAX EXPENSE 8,122 289 7,946 6,405
NET INCOME 34,704 1,236 33,921 38,581
Items that will not be reclassified to profit or loss:        
Remeasurements of defined benefit pension plans 1,193 43 1,527 (1,215)
Unrealized gain or loss on investments in equity instruments at fair value through other comprehensive income 519 18 171 (346)
Gain or loss on hedging instruments subject to basis adjustment 2 0 (1) 2
Share of remeasurements of defined benefit pension plans of associates and joint ventures (4) 0 (2) 2
Income tax relating to items that will not be reclassified to profit or loss (239) (9) (305) 450
Items that will not be reclassified to profit or loss 1,471 52 1,390 (1,107)
Items that may be reclassified subsequently to profit or loss:        
Exchange differences arising from the translation of the foreign operations (177) (6) (61) 90
Share of exchange differences arising from the translation of the foreign operations of associates and joint ventures (4) 0 (1) 3
Income tax relating to items that may be reclassified subsequently 0 0 0 0
Items that may be reclassified subsequently to profit or loss (181) (6) (62) 93
Total other comprehensive income (loss), net of income tax 1,290 46 1,328 (1,014)
TOTAL COMPREHENSIVE INCOME 35,994 1,282 35,249 37,567
NET INCOME ATTRIBUTABLE TO        
Stockholders of the parent 33,419 1,190 32,947 37,557
Noncontrolling interests 1,285 46 974 1,024
NET INCOME 34,704 1,236 33,921 38,581
COMPREHENSIVE INCOME ATTRIBUTABLE TO        
Stockholders of the parent 34,713 1,236 34,282 36,552
Noncontrolling interests 1,281 46 967 1,015
TOTAL COMPREHENSIVE INCOME $ 35,994 $ 1,282 $ 35,249 $ 37,567
EARNINGS PER SHARE        
Basic | (per share) $ 4.31 $ 0.15 $ 4.25 $ 4.84
Diluted | (per share) 4.30 0.15 4.24 4.83
American Depositary Shares [Member]        
EARNINGS PER SHARE        
Basic | (per share) 43.08 1.53 42.47 48.41
Diluted | (per share) $ 43.03 $ 1.53 $ 42.42 $ 48.35