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Property, Plant and Equipment - Summary of Property, Plant and Equipment - Asset Used by The Company (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance $ 283,694,000,000   $ 288,914,000,000  
Depreciation expenses (26,989,000,000)   (26,930,000,000) $ (27,461,000,000)
Additions 25,195,000,000   23,164,000,000 27,979,000,000
Disposal (307,000,000)   (86,000,000) (122,000,000)
Impairment losses 0 $ 0 93,000,000 0
Ending balance 281,416,000,000 $ 10,022 283,694,000,000 288,914,000,000
Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 276,370,000,000      
Impairment losses 0      
Ending balance 273,823,000,000   276,370,000,000  
Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     940,891,000,000 946,460,000,000
Additions       27,979,000,000
Disposal       (33,350,000,000)
Effect of foreign exchange differences       60,000,000
Others       (258,000,000)
Ending balance       940,891,000,000
Carrying Amount [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 918,513,000,000   940,891,000,000  
Effect of retrospective application of IFRS 16     (11,086,000,000)  
Additions 25,195,000,000   23,160,000,000  
Disposal (22,796,000,000)   (32,837,000,000)  
Effect of foreign exchange differences (98,000,000)   (44,000,000)  
Acquired by business combinations (Note 14) 142,000,000      
Others (541,000,000)   (1,571,000,000)  
Ending balance 920,415,000,000   918,513,000,000 940,891,000,000
Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     929,805,000,000  
Ending balance       929,805,000,000
Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (651,977,000,000) (657,752,000,000)
Depreciation expenses       (27,461,000,000)
Disposal       33,228,000,000
Effect of foreign exchange differences       (20,000,000)
Others       28,000,000
Ending balance       (651,977,000,000)
Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (642,143,000,000)   (651,977,000,000)  
Depreciation expenses (26,907,000,000)   (26,856,000,000)  
Effect of retrospective application of IFRS 16     3,842,000,000  
Disposal 22,489,000,000   32,751,000,000  
Impairment losses     (93,000,000)  
Effect of foreign exchange differences 41,000,000   17,000,000  
Acquired by business combinations (Note 14) (94,000,000)      
Others 22,000,000   173,000,000  
Ending balance (646,592,000,000)   (642,143,000,000) (651,977,000,000)
Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (648,135,000,000)  
Ending balance       (648,135,000,000)
Land [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     103,972,000,000  
Ending balance       103,972,000,000
Land [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 99,103,000,000      
Ending balance 101,991,000,000   99,103,000,000  
Land [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     103,972,000,000 104,079,000,000
Additions       0
Disposal       (71,000,000)
Effect of foreign exchange differences       0
Others       (36,000,000)
Ending balance       103,972,000,000
Land [Member] | Carrying Amount [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 99,103,000,000   103,972,000,000  
Effect of retrospective application of IFRS 16     (3,617,000,000)  
Additions 67,000,000   0  
Disposal (270,000,000)   (38,000,000)  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 0      
Others 3,091,000,000   (1,214,000,000)  
Ending balance 101,991,000,000   99,103,000,000 103,972,000,000
Land [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     100,355,000,000  
Ending balance       100,355,000,000
Land [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     0 0
Depreciation expenses       0
Disposal       0
Effect of foreign exchange differences       0
Others       0
Ending balance       0
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 0   0  
Depreciation expenses 0   0  
Effect of retrospective application of IFRS 16     0  
Disposal 0   0  
Impairment losses     0  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 0      
Others 0   0  
Ending balance 0   0 0
Land [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     0  
Ending balance       0
Land improvements [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     263,000,000  
Ending balance       263,000,000
Land improvements [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 243,000,000      
Ending balance 231,000,000   243,000,000  
Land improvements [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     1,601,000,000 1,595,000,000
Additions       0
Disposal       0
Effect of foreign exchange differences       0
Others       6,000,000
Ending balance       1,601,000,000
Land improvements [Member] | Carrying Amount [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 1,618,000,000   1,601,000,000  
Effect of retrospective application of IFRS 16     (1,000,000)  
Additions 0   0  
Disposal (19,000,000)   (7,000,000)  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 0      
Others 31,000,000   25,000,000  
Ending balance 1,630,000,000   1,618,000,000 1,601,000,000
Land improvements [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     1,600,000,000  
Ending balance       1,600,000,000
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (1,338,000,000) (1,293,000,000)
Depreciation expenses       (45,000,000)
Disposal       0
Effect of foreign exchange differences       0
Others       0
Ending balance       (1,338,000,000)
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (1,375,000,000)   (1,338,000,000)  
Depreciation expenses (43,000,000)   (43,000,000)  
Effect of retrospective application of IFRS 16     1,000,000  
Disposal 19,000,000   6,000,000  
Impairment losses     0  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 0      
Others 0   (1,000,000)  
Ending balance (1,399,000,000)   (1,375,000,000) (1,338,000,000)
Land improvements [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (1,337,000,000)  
Ending balance       (1,337,000,000)
Buildings [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     44,784,000,000  
Ending balance       44,784,000,000
Buildings [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 43,024,000,000      
Ending balance 41,642,000,000   43,024,000,000  
Buildings [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     72,911,000,000 72,694,000,000
Additions       21,000,000
Disposal       0
Effect of foreign exchange differences       0
Others       196,000,000
Ending balance       72,911,000,000
Buildings [Member] | Carrying Amount [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 71,001,000,000   72,911,000,000  
Effect of retrospective application of IFRS 16     (3,583,000,000)  
Additions 18,000,000   1,221,000,000  
Disposal (49,000,000)   (3,000,000)  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 0      
Others (81,000,000)   455,000,000  
Ending balance 70,889,000,000   71,001,000,000 72,911,000,000
Buildings [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     69,328,000,000  
Ending balance       69,328,000,000
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (28,127,000,000) (26,799,000,000)
Depreciation expenses       (1,356,000,000)
Disposal       0
Effect of foreign exchange differences       0
Others       28,000,000
Ending balance       (28,127,000,000)
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (27,977,000,000)   (28,127,000,000)  
Depreciation expenses (1,366,000,000)   (1,301,000,000)  
Effect of retrospective application of IFRS 16     1,265,000,000  
Disposal 49,000,000   3,000,000  
Impairment losses     0  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 0      
Others 47,000,000   183,000,000  
Ending balance (29,247,000,000)   (27,977,000,000) (28,127,000,000)
Buildings [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (26,862,000,000)  
Ending balance       (26,862,000,000)
Computer equipment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     2,115,000,000  
Ending balance       2,115,000,000
Computer equipment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 1,937,000,000      
Ending balance 1,767,000,000   1,937,000,000  
Computer equipment [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     14,258,000,000 14,162,000,000
Additions       52,000,000
Disposal       (643,000,000)
Effect of foreign exchange differences       0
Others       687,000,000
Ending balance       14,258,000,000
Computer equipment [Member] | Carrying Amount [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 13,005,000,000   14,258,000,000  
Effect of retrospective application of IFRS 16     0  
Additions 55,000,000   57,000,000  
Disposal (1,245,000,000)   (1,916,000,000)  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 70,000,000      
Others 521,000,000   606,000,000  
Ending balance 12,406,000,000   13,005,000,000 14,258,000,000
Computer equipment [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     14,258,000,000  
Ending balance       14,258,000,000
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (12,143,000,000) (11,788,000,000)
Depreciation expenses       (983,000,000)
Disposal       632,000,000
Effect of foreign exchange differences       0
Others       (4,000,000)
Ending balance       (12,143,000,000)
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (11,068,000,000)   (12,143,000,000)  
Depreciation expenses (770,000,000)   (827,000,000)  
Effect of retrospective application of IFRS 16     0  
Disposal 1,243,000,000   1,909,000,000  
Impairment losses     0  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) (40,000,000)      
Others (4,000,000)   (7,000,000)  
Ending balance (10,639,000,000)   (11,068,000,000) (12,143,000,000)
Computer equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (12,143,000,000)  
Ending balance       (12,143,000,000)
Telecommunications equipment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     116,322,000,000  
Ending balance       116,322,000,000
Telecommunications equipment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 115,694,000,000      
Ending balance 117,113,000,000   115,694,000,000  
Telecommunications equipment [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     715,748,000,000 722,054,000,000
Additions       159,000,000
Disposal       (31,984,000,000)
Effect of foreign exchange differences       60,000,000
Others       25,459,000,000
Ending balance       715,748,000,000
Telecommunications equipment [Member] | Carrying Amount [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 706,032,000,000   715,748,000,000  
Effect of retrospective application of IFRS 16     (3,885,000,000)  
Additions 118,000,000   120,000,000  
Disposal (20,619,000,000)   (30,417,000,000)  
Effect of foreign exchange differences (91,000,000)   (37,000,000)  
Acquired by business combinations (Note 14) 0      
Others 25,336,000,000   24,503,000,000  
Ending balance 710,776,000,000   706,032,000,000 715,748,000,000
Telecommunications equipment [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     711,863,000,000  
Ending balance       711,863,000,000
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (599,426,000,000) (607,154,000,000)
Depreciation expenses       (24,236,000,000)
Disposal       31,952,000,000
Effect of foreign exchange differences       (20,000,000)
Others       32,000,000
Ending balance       (599,426,000,000)
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (590,338,000,000)   (599,426,000,000)  
Depreciation expenses (23,994,000,000)   (23,906,000,000)  
Effect of retrospective application of IFRS 16     2,576,000,000  
Disposal 20,600,000,000   30,380,000,000  
Impairment losses     0  
Effect of foreign exchange differences 41,000,000   16,000,000  
Acquired by business combinations (Note 14) 0      
Others 28,000,000   22,000,000  
Ending balance (593,663,000,000)   (590,338,000,000) (599,426,000,000)
Telecommunications equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (596,850,000,000)  
Ending balance       (596,850,000,000)
Transportation equipment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     231,000,000  
Ending balance       231,000,000
Transportation equipment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 218,000,000      
Ending balance 176,000,000   218,000,000  
Transportation equipment [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     3,882,000,000 3,834,000,000
Additions       0
Disposal       (29,000,000)
Effect of foreign exchange differences       0
Others       77,000,000
Ending balance       3,882,000,000
Transportation equipment [Member] | Carrying Amount [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 3,912,000,000   3,882,000,000  
Effect of retrospective application of IFRS 16     0  
Additions 1,000,000   1,000,000  
Disposal (45,000,000)   (51,000,000)  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 0      
Others 26,000,000   80,000,000  
Ending balance 3,894,000,000   3,912,000,000 3,882,000,000
Transportation equipment [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     3,882,000,000  
Ending balance       3,882,000,000
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (3,651,000,000) (3,513,000,000)
Depreciation expenses       (162,000,000)
Disposal       29,000,000
Effect of foreign exchange differences       0
Others       (5,000,000)
Ending balance       (3,651,000,000)
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (3,694,000,000)   (3,651,000,000)  
Depreciation expenses (68,000,000)   (91,000,000)  
Effect of retrospective application of IFRS 16     0  
Disposal 45,000,000   51,000,000  
Impairment losses     0  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 0      
Others (1,000,000)   (3,000,000)  
Ending balance (3,718,000,000)   (3,694,000,000) (3,651,000,000)
Transportation equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (3,651,000,000)  
Ending balance       (3,651,000,000)
Miscellaneous equipment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     2,582,000,000  
Ending balance       2,582,000,000
Miscellaneous equipment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 2,428,000,000      
Ending balance 2,374,000,000   2,428,000,000  
Miscellaneous equipment [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     9,874,000,000 9,515,000,000
Additions       334,000,000
Disposal       (623,000,000)
Effect of foreign exchange differences       0
Others       648,000,000
Ending balance       9,874,000,000
Miscellaneous equipment [Member] | Carrying Amount [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 10,090,000,000   9,874,000,000  
Effect of retrospective application of IFRS 16     0  
Additions 150,000,000   149,000,000  
Disposal (520,000,000)   (405,000,000)  
Effect of foreign exchange differences 0   (1,000,000)  
Acquired by business combinations (Note 14) 72,000,000      
Others 508,000,000   473,000,000  
Ending balance 10,300,000,000   10,090,000,000 9,874,000,000
Miscellaneous equipment [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     9,874,000,000  
Ending balance       9,874,000,000
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (7,292,000,000) (7,205,000,000)
Depreciation expenses       (679,000,000)
Disposal       615,000,000
Effect of foreign exchange differences       0
Others       (23,000,000)
Ending balance       (7,292,000,000)
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (7,662,000,000)   (7,292,000,000)  
Depreciation expenses (666,000,000)   (688,000,000)  
Effect of retrospective application of IFRS 16     0  
Disposal 504,000,000   402,000,000  
Impairment losses     (64,000,000)  
Effect of foreign exchange differences 0   1,000,000  
Acquired by business combinations (Note 14) (54,000,000)      
Others (48,000,000)   (21,000,000)  
Ending balance (7,926,000,000)   (7,662,000,000) (7,292,000,000)
Miscellaneous equipment [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     (7,292,000,000)  
Ending balance       (7,292,000,000)
Construction in progress and equipment to be accepted [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     18,645,000,000  
Ending balance       18,645,000,000
Construction in progress and equipment to be accepted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 13,723,000,000      
Ending balance 8,529,000,000   13,723,000,000  
Construction in progress and equipment to be accepted [Member] | Carrying Amount [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     18,645,000,000 18,527,000,000
Additions       27,413,000,000
Disposal       0
Effect of foreign exchange differences       0
Others       (27,295,000,000)
Ending balance       18,645,000,000
Construction in progress and equipment to be accepted [Member] | Carrying Amount [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance 13,752,000,000   18,645,000,000  
Effect of retrospective application of IFRS 16     0  
Additions 24,786,000,000   21,612,000,000  
Disposal (29,000,000)   0  
Effect of foreign exchange differences (7,000,000)   (6,000,000)  
Acquired by business combinations (Note 14) 0      
Others (29,973,000,000)   (26,499,000,000)  
Ending balance 8,529,000,000   13,752,000,000 18,645,000,000
Construction in progress and equipment to be accepted [Member] | Carrying Amount [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     18,645,000,000  
Ending balance       18,645,000,000
Construction in progress and equipment to be accepted [Member] | Accumulated depreciation, amortization and impairment [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     0 0
Depreciation expenses       0
Disposal       0
Effect of foreign exchange differences       0
Others       0
Ending balance       0
Construction in progress and equipment to be accepted [Member] | Accumulated depreciation, amortization and impairment [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance (29,000,000)   0  
Depreciation expenses 0   0  
Effect of retrospective application of IFRS 16     0  
Disposal 29,000,000   0  
Impairment losses     (29,000,000)  
Effect of foreign exchange differences 0   0  
Acquired by business combinations (Note 14) 0      
Others 0   0  
Ending balance $ 0   (29,000,000) 0
Construction in progress and equipment to be accepted [Member] | Accumulated depreciation, amortization and impairment [Member] | As Adjusted [Member] | Assets Used by the Company [Member]        
Disclosure Of Property Plant And Equipment [Line Items]        
Beginning balance     $ 0  
Ending balance       $ 0