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Significant Basis Of Preparation And Accounting Policies_Estimated useful life for intangible assets (Details)
 12 Months Ended
Dec. 31, 2020
Usage rights for donated assets  
Disclosure of intangible assets with indefinite useful life [Line Items]  
Useful lives (years) 10 ~ 30
Amortization methods Straight line
Software  
Disclosure of intangible assets with indefinite useful life [Line Items]  
Useful lives (years) 4, 5
Amortization methods Straight line
Industrial rights  
Disclosure of intangible assets with indefinite useful life [Line Items]  
Useful lives (years) 5 ~ 10
Amortization methods Straight line
Development expenditures  
Disclosure of intangible assets with indefinite useful life [Line Items]  
Useful lives (years) 5
Amortization methods Straight line
Leasehold rights  
Disclosure of intangible assets with indefinite useful life [Line Items]  
Useful lives (years) 8 ~ 10
Amortization methods Straight line
Other intangible assets  
Disclosure of intangible assets with indefinite useful life [Line Items]  
Useful lives (years) 3 ~ 50 or indefinite
Amortization methods Straight line
Mining rights  
Disclosure of intangible assets with indefinite useful life [Line Items]  
Useful lives (years) -
Amortization methods Unit of production