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Lease Arrangements - Future Aggregate Minimum Lease Payments Under Non-Cancellable Operating Leases (Details) $ in Millions | Dec. 31, 2018 TWD ($)
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Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |
Minimum lease payments under non-cancellable operating leases | $ 10,558
Within one year [Member] |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |
Minimum lease payments under non-cancellable operating leases | 3,439
1-5 Years [Member] |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |
Minimum lease payments under non-cancellable operating leases | 6,375
More Than 5 Years [Member] |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |
Minimum lease payments under non-cancellable operating leases | $ 744

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