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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 15, 2022 | Jan. 27, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | May 25, 2022 | May 23, 2022 | Apr. 22, 2022 | Apr. 15, 2022 | Dec. 31, 2021
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments not required to be disclosed |  |  | $ 357 |  | $ 357 |  |  |  |  |  | $ 371
Debt issuance costs | $ 10 |  |  |  |  |  |  |  |  |  |
Debt issuance costs, after tax | 8 |  |  |  |  |  |  |  |  |  |
Losses on deferred cash flows | 7 |  |  |  |  |  |  |  |  |  |
Losses on deferred cash flows, net | 5 |  |  |  |  |  |  |  |  |  |
Corporate-Owned Life Insurance |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on investments |  |  | $ (16) | $ 6 | $ (22) | $ 8 |  |  |  |  |
FEV | Global Holding |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  | 33.30% |  | 33.30% |  |  |  |  |  |
Equity method investments |  |  | $ 65 |  | $ 65 |  |  |  |  |  | 59
Proceeds from dividends received |  |  | 70 |  |  |  |  |  |  |  |
FEV | Global Holding | Corporate and Other | Other Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from equity method investments |  |  | 64 | $ 4 | 76 | $ 4 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Make-whole premium | 101 |  |  |  |  |  |  |  |  |  |
Early repayment of debt | 1,100 |  |  |  |  |  |  |  |  |  |
Make-whole premium, net | 80 |  |  |  |  |  |  |  |  |  |
4.25% Series B Senior Notes Due 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  | 850
Make-whole premium |  |  |  |  |  |  |  |  |  |  | 38
Make-whole premium, net |  |  |  |  |  |  |  |  |  |  | $ 30
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 |  |  |  |  |  |  |  |  |
3.34% FMB's Due April 2022 | First Mortgage Bond | WP |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  | $ 100 |
Stated interest rate |  |  |  |  |  |  |  |  |  | 3.34% |
3.79%, 150 Million FMB's Due December 2032 | First Mortgage Bond | Penn |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 150 |  |
Stated interest rate |  |  |  |  |  |  |  |  | 3.79% |  |
$500 Million 2.85% Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 500 |  |  |
Stated interest rate |  |  |  |  |  |  |  | 2.85% |  |  |
6.5% $100 Million FMB's Due June 2022 | First Mortgage Bond | Penn |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 100 |  | $ 100 |  |  |  |  |  |
Stated interest rate |  |  | 6.09% |  | 6.09% |  |  |  |  |  |
Series C 7.375% Senior Notes Due 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Early repayment of debt | 715 |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  | $ 1,500 |  |  |  |
Series C 4.85% Senior Notes Due 2047 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Early repayment of debt | $ 284 |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  | $ 1,000 |  |  |  |

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