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Lease Arrangements - Other lease information (Details) - TWD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Presentation of leases for lessee [abstract]      
Expenses relating to short-term leases $ 5,250.3 $ 3,153.5 $ 5,007.1
Expenses relating to variable lease payments not included in the measurement of lease liabilities 168.7 257.0 195.1
Total cash outflow for leases $ 7,510.8 $ 6,354.6 $ 7,724.4