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Consolidated Statements of Comprehensive Income
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
TWD ($)
$ / shares
Dec. 31, 2019
TWD ($)
$ / shares
Statement [LineItems]        
REVENUES $ 210,478 $ 7,588 $ 207,609 $ 207,520
OPERATING COSTS 135,111 4,871 137,029 135,953
GROSS PROFIT 75,367 2,717 70,580 71,567
OPERATING EXPENSES        
Marketing 20,944 755 20,913 22,220
General and administrative 5,293 191 5,006 4,758
Research and development 3,688 133 3,850 3,941
Expected credit loss (reversal of credit loss) 143 5 45 (125)
Total operating expenses 30,068 1,084 29,814 30,794
OTHER INCOME AND EXPENSES (369) (13) 1,595 (127)
INCOME FROM OPERATIONS 44,930 1,620 42,361 40,646
NON-OPERATING INCOME AND EXPENSES        
Interest income 95 3 116 251
Other income 378 14 470 531
Other gains and losses 461 17 (159) 84
Interest expense (218) (8) (206) (104)
Share of profits of associates and joint ventures accounted for using equity method 421 15 244 459
Total non-operating income and expenses 1,137 41 465 1,221
INCOME BEFORE INCOME TAX 46,067 1,661 42,826 41,867
INCOME TAX EXPENSE 9,020 325 8,122 7,946
NET INCOME 37,047 1,336 34,704 33,921
Items that will not be reclassified to profit or loss:        
Remeasurements of defined benefit pension plans 390 14 1,193 1,527
Unrealized gain or loss on investments in equity instruments at fair value through other comprehensive income (1,186) (43) 519 171
Gain or loss on hedging instruments subject to basis adjustment (10) 0 2 (1)
Share of remeasurements of defined benefit pension plans of associates and joint ventures (4) 0 (4) (2)
Income tax relating to items that will not be reclassified to profit or loss (78) (3) (239) (305)
Items that will not be reclassified to profit or loss (888) (32) 1,471 1,390
Items that may be reclassified subsequently to profit or loss:        
Exchange differences arising from the translation of the foreign operations (77) (3) (177) (61)
Share of exchange differences arising from the translation of the foreign operations of associates and joint ventures (1) 0 (4) (1)
Income tax relating to items that may be reclassified subsequently 0 0 0 0
Items that may be reclassified subsequently to profit or loss (78) (3) (181) (62)
Total other comprehensive income (loss), net of income tax (966) (35) 1,290 1,328
TOTAL COMPREHENSIVE INCOME 36,081 1,301 35,994 35,249
NET INCOME ATTRIBUTABLE TO        
Stockholders of the parent 35,616 1,284 33,419 32,947
Noncontrolling interests 1,431 52 1,285 974
NET INCOME 37,047 1,336 34,704 33,921
COMPREHENSIVE INCOME ATTRIBUTABLE TO        
Stockholders of the parent 34,652 1,249 34,713 34,282
Noncontrolling interests 1,429 52 1,281 967
TOTAL COMPREHENSIVE INCOME $ 36,081 $ 1,301 $ 35,994 $ 35,249
EARNINGS PER SHARE        
Basic | (per share) $ 4.59 $ 0.17 $ 4.31 $ 4.25
Diluted | (per share) 4.59 0.17 4.30 4.24
American Depositary Shares [Member]        
EARNINGS PER SHARE        
Basic | (per share) 45.91 1.66 43.08 42.47
Diluted | (per share) $ 45.86 $ 1.65 $ 43.03 $ 42.42