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Pension and Other Postretirement Benefits (OPEB) - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total benefit costs | $ 19 | $ 17 | $ 37 | $ 34
Defined benefit plan, expected future employer contributions, next fiscal year | 100 |  | 100 |
Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total benefit costs | 0 | 2 | 1 | 3
Defined benefit plan, expected future employer contributions, current fiscal year | 5 |  | 5 |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, expected future employer contributions, current fiscal year | 23 |  | 23 |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total benefit costs | 6 | 7 | 12 | 13
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Postretirement Healthcare Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total benefit costs | $ 4 | $ 4 | $ 7 | $ 7

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