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Revenue - Summary of Changes in Contract Assets and Contract Liabilities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Contract assets      
Net increase of customer contracts $ 8,617 $ 7,961 $ 6,933
Reclassified to trade receivables (7,443) (6,574) (6,149)
Significant changes of contract assets 1,174 1,387 784
Contract liabilities      
Net increase of customer contracts 197 187 9
Recognized as revenues (184) (173) (5)
Significant changes of contract liabilities $ 13 $ 14 $ 4