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Significant Basis Of Preparation And Accounting Policies_Estimated economic useful lives for premises and equipment except for land (Details)
 12 Months Ended
Dec. 31, 2019
Buildings  
Disclosure of useful life of property plant and equipment [Line Items]  
Useful lives (years) 8 ~ 40
Structures  
Disclosure of useful life of property plant and equipment [Line Items]  
Useful lives (years) 8 ~ 50
Machinery  
Disclosure of useful life of property plant and equipment [Line Items]  
Useful lives (years) 2 ~ 32
Vehicles  
Disclosure of useful life of property plant and equipment [Line Items]  
Useful lives (years) 3 ~ 8
Loaded heavy water  
Disclosure of useful life of property plant and equipment [Line Items]  
Useful lives (years) 30
Asset retirement costs  
Disclosure of useful life of property plant and equipment [Line Items]  
Useful lives (years) 18, 30, 40, 60
Right-of-use assets  
Disclosure of useful life of property plant and equipment [Line Items]  
Useful lives (years) 1 ~ 32
Ships  
Disclosure of useful life of property plant and equipment [Line Items]  
Useful lives (years) 9
Others  
Disclosure of useful life of property plant and equipment [Line Items]  
Useful lives (years) 4 ~ 15