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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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