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Consolidated Statements of Common Stockholders' Equity (FirstEnergy Corp.) - USD ($)
$ in Millions
Total
Common Stock
OPIC
AOCI
Retained Earnings (Accumulated Deficit)
Series A Convertible Preferred Stock
Beginning Balance, Shares at Dec. 31, 2015   424,000,000       0
Beginning Balance at Dec. 31, 2015 $ 12,421 $ 42 $ 9,952 $ 171 $ 2,256 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) (6,177)       (6,177)  
Other comprehensive loss, net of tax 3     3    
Amortized gain (loss) on derivative hedges, net of income taxes 3     3    
Stock-based compensation 49   49      
Cash dividends declared on common stock (611)       (611)  
Stock Investment Plan and certain share-based benefit plans, shares   2,700,000        
Stock Investment Plan and certain share-based benefit plans 56   56      
Stock issuance (Note 13), shares   16,000,000        
Stock issuance (Note 13) 500 $ 2 498      
Ending Balance, Shares at Dec. 31, 2016   442,000,000       0
Ending Balance at Dec. 31, 2016 6,241 $ 44 10,555 174 (4,532) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) (1,724)       (1,724)  
Other comprehensive loss, net of tax (32)     (32)    
Amortized gain (loss) on derivative hedges, net of income taxes (32)     (32)    
Stock-based compensation 36   36      
Cash dividends declared on common stock (639)   (639)      
Stock Investment Plan and certain share-based benefit plans, shares   3,000,000        
Stock Investment Plan and certain share-based benefit plans 56   56      
Reclass to liability awards $ (7)   (7)      
Ending Balance, Shares at Dec. 31, 2017 445,334,111 445,000,000       0
Ending Balance at Dec. 31, 2017 $ 3,925 $ 44 10,001 142 (6,262) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation accounting change (6)       (6)  
Net Income (Loss) 1,348       1,348  
Other comprehensive loss, net of tax (101)     (101)    
Stock-based compensation 60   60      
Cash dividends declared on common stock (906)   (906)      
Stock Investment Plan and certain share-based benefit plans, shares   3,200,000        
Stock Investment Plan and certain share-based benefit plans 62 $ 1 61      
Stock issuance (Note 13), shares   30,000,000       1,600,000
Stock issuance (Note 13) 2,462 $ 3 2,297     $ 162
Conversion of Series A Convertible Stock (Note 13), Shares   33,000,000       (900,000)
Conversion of Series A Convertible Stock (Note 13) 0 $ 3 88     $ (91)
Cash dividends declared on preferred stock (71)   (71)      
Impact of adopting new accounting pronouncements $ 35       35  
Ending Balance, Shares at Dec. 31, 2018 511,915,450 512,000,000       700,000
Ending Balance at Dec. 31, 2018 $ 6,814 $ 51 $ 11,530 $ 41 $ (4,879) $ 71