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Investment Properties - Summary of Investment Properties (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about investment property [Line Items]        
Beginning balance $ 9,621      
Depreciation expense (42)   $ (22) $ (25)
Reversal of impairment loss 83 $ 3 27 57
Ending balance 9,663 $ 348 9,621  
Gross carrying amount [Member]        
Disclosure of detailed information about investment property [Line Items]        
Beginning balance 10,662   9,214 9,392
Additions 1   1,359 1
Disposal     (37) (6)
Reclassification     126 (173)
Ending balance 10,663   10,662 9,214
Accumulated depreciation, amortization and impairment [Member]        
Disclosure of detailed information about investment property [Line Items]        
Beginning balance (1,041)   (1,045) (1,105)
Depreciation expense (42)   (22) (25)
Disposal       6
Reclassification     (1) 22
Reversal of impairment loss 83   27 57
Ending balance (1,000)   (1,041) (1,045)
Beginning balance, net 9,621   8,169 8,287
Ending balance, net $ 9,663   $ 9,621 $ 8,169