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Non-Cash Transactions - Non-cash Investing Activities (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Noncash Investing Activities [Abstract]        
Increase in property, plant and equipment $ 25,195   $ 23,164 $ 27,979
Other payables (1,684)   1,002 571
Acquisition of property, plant and equipment 23,511 $ 838 24,166 28,550
Increase in investment properties 1,359   1 6
Trade-in investment properties from asset exchange transaction (Note 16) (1,305)   0 0
Acquisition of investment properties 54 2 1 6
Increase in intangible assets 48,605   363 498
Changes in other assets (1,000)   0 0
Acquisition of intangible assets 47,605 1,695 363 498
Disposal of property, plant and equipment, net 307   86 122
Gain (loss) on disposal of property, plant and equipment 1,428 51 (38) 142
Trade-in investment properties from asset exchange transaction (Note 16) (1,305)   0 0
Changes in other payables (80)   0 0
Changes in other current monetary assets (31)   0 0
Proceeds from disposal of property, plant and equipment $ 319 $ 11 $ 48 $ 264