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Consolidated Statements of Profit or Loss and Other 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]        
NET REVENUE $ 1,031,473.6 $ 33,697.3 $ 977,447.2 $ 947,938.3
COST OF REVENUE 533,487.5 17,428.6 482,616.2 473,077.1
GROSS PROFIT BEFORE UNREALIZED GROSS PROFIT ON SALES TO ASSOCIATES 497,986.1 16,268.7 494,831.0 474,861.2
UNREALIZED GROSS PROFIT ON SALES TO ASSOCIATES (111.8) (3.6) (4.6) (29.1)
GROSS PROFIT 497,874.3 16,265.1 494,826.4 474,832.1
OPERATING EXPENSES        
Research and development 85,895.6 2,806.1 80,732.5 71,207.7
General and administrative 20,265.9 662.1 21,196.7 19,795.6
Marketing 5,987.8 195.6 5,972.5 5,900.8
Total operating expenses 112,149.3 3,663.8 107,901.7 96,904.1
OTHER OPERATING INCOME AND EXPENSES, NET (2,101.5) (68.7) (1,365.5) 29.8
INCOME FROM OPERATIONS 383,623.5 12,532.6 385,559.2 377,957.8
NON-OPERATING INCOME AND EXPENSES        
Share of profits of associates 3,090.6 101.0 3,014.8 3,457.9
Other income 14,852.8 485.2 9,610.3 6,454.9
Foreign exchange gain (loss), net 2,438.2 79.7 (1,509.5) 1,161.3
Finance costs (3,051.2) (99.7) (3,330.3) (3,306.1)
Other gains and losses, net (3,410.8) (111.4) 2,817.4 195.9
Total non-operating income and expenses 13,919.6 454.8 10,602.7 7,963.9
INCOME BEFORE INCOME TAX 397,543.1 12,987.4 396,161.9 385,921.7
INCOME TAX EXPENSE 34,436.9 1,125.1 51,122.9 54,124.4
NET INCOME 363,106.2 11,862.3 345,039.0 331,797.3
OTHER COMPREHENSIVE INCOME (LOSS) - Items that will not be reclassified subsequently to profit or loss        
Remeasurement of defined benefit obligation (861.2) (28.1) (254.7) (1,057.2)
Unrealized loss on investments in equity instruments at fair value through other comprehensive income (3,309.1) (108.1)    
Gain on hedging instruments 41.0 1.3    
Share of other comprehensive loss of associates (14.2) (0.5) (20.9) (20.0)
Income tax benefit related to items that will not be reclassified subsequently 195.7 6.4 30.6 126.9
Total items that will not be reclassified subsequently to profit or loss (3,947.8) (129.0) (245.0) (950.3)
OTHER COMPREHENSIVE INCOME (LOSS) - Items that may be reclassified subsequently to profit or loss        
Exchange differences arising on translation of foreign operations 14,562.4 475.7 (28,259.6) (9,379.5)
Changes in fair value of available-for-sale financial assets     (218.8) (692.5)
Cash flow hedges     4.7  
Unrealized loss on investments in debt instruments at fair value through other comprehensive income (870.9) (28.4)    
Share of other comprehensive income (loss) of associates 93.3 3.1 (99.4) 16.3
Income tax expense related to items that may be reclassified subsequently     (3.5) (61.2)
Total items that may be reclassified subsequently to profit or loss 13,784.8 450.4 (28,576.6) (10,116.9)
Other comprehensive loss for the year, net of income tax 9,837.0 321.4 (28,821.6) (11,067.2)
TOTAL COMPREHENSIVE INCOME FOR THE YEAR 372,943.2 12,183.7 316,217.4 320,730.1
NET INCOME ATTRIBUTABLE TO:        
Shareholders of the parent 363,052.7 11,860.6 344,998.3 331,713.7
Non-controlling interests 53.5 1.7 40.7 83.6
NET INCOME 363,106.2 11,862.3 345,039.0 331,797.3
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO:        
Shareholders of the parent 372,886.8 12,181.9 316,181.8 320,653.2
Non-controlling interests 56.4 1.8 35.6 76.9
TOTAL COMPREHENSIVE INCOME FOR THE YEAR $ 372,943.2 $ 12,183.7 $ 316,217.4 $ 320,730.1
EARNINGS PER SHARE        
Basic earnings per share | (per share) $ 14.00 $ 0.46 $ 13.30 $ 12.79
Diluted earnings per share | (per share) 14.00 0.46 13.30 12.79
American Depositary Shares (one represents five common shares) [member]        
EARNINGS PER SHARE        
Basic earnings per share | (per share) 70.01 2.29 66.52 63.96
Diluted earnings per share | (per share) $ 70.01 $ 2.29 $ 66.52 $ 63.96