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Revenue - Summary of Changes in Contract Assets and Contract Liabilities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Contract assets      
Net increase of customer contracts $ 7,961 $ 6,933 $ 6,035
Reclassified to trade receivables (6,574) (6,149) (6,039)
Significant changes of contract assets 1,387 784 (4)
Contract liabilities      
Net increase of customer contracts 187 9 0
Recognized as revenues (173) (5) (12)
Significant changes of contract liabilities $ 14 $ 4 $ (12)