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Non-Cash Transactions - Non-cash Investing Activities (Detail) - TWD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Noncash Investing Activities [Abstract]      
Increase in property, plant and equipment $ 27,979 $ 26,069 $ 24,591
Other payables 571 806 (1,074)
Non-cash investing activities $ 28,550 $ 26,875 $ 23,517