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Pension, OPEB and Savings Plans (Estimated Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2023 USD ($)
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Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | $ 364
Payments Expected Year Two | 325
Payments Expected Year Three | 331
Payments Expected Year Four | 338
Payments Expected Year Five | 343
Payments Expected Thereafter | 1,758
Total Estimated Future Benefit Payments | 3,459
Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 74
Payments Expected Year Two | 73
Payments Expected Year Three | 71
Payments Expected Year Four | 69
Payments Expected Year Five | 67
Payments Expected Thereafter | 288
Total Estimated Future Benefit Payments | 642
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 15
Payments Expected Year Two | 17
Payments Expected Year Three | 20
Payments Expected Year Four | 23
Payments Expected Year Five | 25
Payments Expected Thereafter | 167
Total Estimated Future Benefit Payments | 267
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 12
Payments Expected Year Two | 14
Payments Expected Year Three | 16
Payments Expected Year Four | 18
Payments Expected Year Five | 20
Payments Expected Thereafter | 125
Total Estimated Future Benefit Payments | $ 205

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