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FAIR VALUE MEASUREMENTS - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
May 04, 2023
USD ($)
tradingDay
May 01, 2023
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
May 31, 2023
USD ($)
Apr. 30, 2023
Dec. 31, 2022
USD ($)
Fair Value of Financial Instruments [Line Items]                  
Investments not required to be disclosed | $     $ 358   $ 358       $ 351
Debt instrument, conversion rate         0.021362        
2026 Convertible Notes | Unsecured Debt                  
Fair Value of Financial Instruments [Line Items]                  
Issuance interest rate               4.00%  
FE | 4.00%, 1,300 Million Notes Maturity 2026 | Promissory Notes                  
Fair Value of Financial Instruments [Line Items]                  
Face amount of debt | $ $ 1,500           $ 1,500    
Issuance interest rate             4.00%    
Debt instrument, convertible, threshold trading days 20                
Debt instrument, convertible, threshold consecutive trading days 30                
Debt instrument, convertible, threshold percentage of stock price trigger 130.00%                
Debt instrument, convertible, business days 5                
Threshold trading days measurement period 10                
Debt instrument, measurement period percentage 98.00%                
Debt instrument, conversion price (in dollars per share) | $ / shares     $ 46.81   $ 46.81        
Debt instrument convertible premium   0.20              
Repurchase price, percentage   100              
Corporate-Owned Life Insurance                  
Fair Value of Financial Instruments [Line Items]                  
Gain (loss) on investments | $     $ (4) $ (6) $ 6 $ (28)