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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | Jan. 27, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Fair Value of Financial Instruments [Line Items] |  |  |
Investments not required to be disclosed |  | $ 375 | $ 371
4.25% Series B Senior Notes Due 2023 | Senior Notes |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |
Face amount of debt |  |  | $ 850
Stated interest rate |  |  | 4.25%
Debt Instrument, Unamortized Premium |  |  | $ 38
2.77% Series A Senior Notes Due 2034 | Senior Notes | The Cleveland Electric Illuminating Company |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |
Face amount of debt | $ 150 |  |
Stated interest rate | 2.77% |  |
2.65%, 150 Million Notes Maturing 2028 | Senior Notes | TE |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |
Stated interest rate | 2.65% |  |
Early repayment of debt | $ 25 |  |

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