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Financing Activities - Distributions and Capital Contributions (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Distributions [Line Items]        
Current quarterly common stock dividend (in dollars per share) $ 0.4150 $ 1.66 $ 1.65 $ 1.64
Annualized current quarterly common stock dividend (in dollars per share) $ 1.66      
Deferred Interest Payment   $ 0    
LKE [Member]        
Distributions [Line Items]        
Restricted net assets at end of period   3,000    
Unrestricted assets at the end of period   $ 3,700    
Minimum adjusted equity to total capitalization in order to pay dividends   30.00%    
LG And E And KU Energy LLC [Member]        
Distributions [Line Items]        
Restricted net assets at end of period   $ 3,000    
Unrestricted assets at the end of period   $ 3,700    
Minimum adjusted equity to total capitalization in order to pay dividends   30.00%    
Louisville Gas And Electric Co [Member]        
Distributions [Line Items]        
Restricted net assets at end of period   $ 1,300    
Unrestricted assets at the end of period   $ 1,700    
Minimum adjusted equity to total capitalization in order to pay dividends   30.00%    
Kentucky Utilities Co [Member]        
Distributions [Line Items]        
Restricted net assets at end of period   $ 1,700    
Unrestricted assets at the end of period   $ 2,000    
Minimum adjusted equity to total capitalization in order to pay dividends   30.00%