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Non-Cash Transactions - Non-cash Investing Activities (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Noncash Investing Activities [Abstract]        
Increase in property, plant and equipment $ 35,613   $ 25,195 $ 23,164
Changes in other payables (280)   (1,684) 1,002
Acquisition of property, plant and equipment 35,333 $ 1,274 23,511 24,166
Increase in investment properties 1   1,359 1
Trade-in investment properties from asset exchange transaction (Note 16) 0   (1,305) 0
Acquisition of investment properties 1 0 54 1
Increase in intangible assets 256   48,605 363
Changes in other assets 0   (1,000) 0
Acquisition of intangible assets 256 9 47,605 363
Disposal of property, plant and equipment 30   307 86
Gain (loss) on disposal of property, plant and equipment (3) 0 1,428 (38)
Trade-in investment properties from asset exchange transaction (Note 16) 0   (1,305) 0
Changes in other payables 0   (80) 0
Changes in other current monetary assets 0   (31) 0
Proceeds from disposal of property, plant and equipment 27 1 319 48
Disposal of financial assets at fair value through other comprehensive income 2,705   568 0
Changes in other current monetary assets 271   (271) 0
Reclassified to investment accounted for using equity method (64)   0 0
Proceeds from disposal of financial assets at fair value through other comprehensive income $ 2,912 $ 105 $ 297 $ 0