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Revenue - Summary of Changes in Contract Assets and Contract Liabilities (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Contract assets  
Net increase of customer contracts $ 4,126
Reclassified to trade receivables (7,532)
Significant changes of contract assets (3,406)
Contract liabilities  
Net increase of customer contracts 16
Recognized as revenues (194)
Significant changes of contract liabilities $ (178)