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Electric plant, construction and related agreements: - Construction information (Details)
1 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2016
USD ($)
item
Dec. 31, 2008
USD ($)
item
MW
Jan. 31, 2016
USD ($)
Toshiba Corporation        
Construction        
Goodwill impairment charge   $ 6,000,000,000    
Engineering, Procurement and Construction Agreement (the EPC Agreement) | Westinghouse Electric Company LLC and Stone & Webster, Inc. (collectively, the Contractor)        
Construction        
Liquidated damages, as a percent of contract price     10.00%  
Engineering, Procurement and Construction Agreement (the EPC Agreement) | Westinghouse Electric Company LLC and Stone & Webster, Inc. (collectively, the Contractor) | Minimum        
Construction        
Liquidated damages     $ 920,000,000  
Engineering, Procurement and Construction Agreement (the EPC Agreement) | Westinghouse Electric Company LLC and Stone & Webster, Inc. (collectively, the Contractor) | Maximum        
Construction        
Liquidated damages     930,000,000  
Additional capital cost under the provision     $ 75,000,000  
Engineering, Procurement and Construction Agreement (the EPC Agreement) | Westinghouse Electric Company LLC | Toshiba Corporation        
Construction        
Letters of credit       $ 920,000,000
Vogtle Units Number 3 And Number 4        
Construction        
Project budget including capital costs, allowance for funds used during construction   5,000,000,000    
Total investment in additional vogtle units   3,269,000,000    
Anticipated additional costs per month on failure to meet revised forecasted in-service dates   $ 20,000,000    
Vogtle Units Number 3 And Number 4 | Ownership participation agreement        
Construction        
Number of nuclear units | item   2    
Ownership interest (as a percent)   30.00%    
Vogtle Units Number 3 And Number 4 | Engineering, Procurement and Construction Agreement (the EPC Agreement) | Westinghouse Electric Company LLC and Stone & Webster, Inc. (collectively, the Contractor)        
Construction        
Number of nuclear units | item     2  
Generating capacity of each nuclear unit | MW     1,100  
Vogtle Unit Number 3        
Construction        
Period of delay projected in service date 6 months      
Vogtle Unit Number 4        
Construction        
Period of delay projected in service date 3 months