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FAIR VALUE MEASUREMENTS - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
May 04, 2023
USD ($)
tradingDay
May 01, 2023
Jun. 30, 2023
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
$ / shares
Jun. 30, 2022
USD ($)
Apr. 30, 2023
Dec. 31, 2022
USD ($)
Fair Value of Financial Instruments [Line Items]                
Investments not required to be disclosed | $     $ 364   $ 364     $ 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              
Issuance interest rate 4.00%              
Debt instrument, conversion price (in dollars per share) | $ / shares     $ 46.81   $ 46.81      
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 convertible premium   0.20            
Repurchase price, percentage   1            
Corporate-Owned Life Insurance                
Fair Value of Financial Instruments [Line Items]                
Gain (loss) on investments | $     $ 3 $ (16) $ 10 $ (22)