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Pension, OPEB and Savings Plans (Estimated Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2022 USD ($)
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Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | $ 424
Payments Expected Year Two | 400
Payments Expected Year Three | 405
Payments Expected Year Four | 411
Payments Expected Year Five | 418
Payments Expected Thereafter | 2,124
Total Estimated Future Benefit Payments | 4,182
Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 77
Payments Expected Year Two | 75
Payments Expected Year Three | 74
Payments Expected Year Four | 72
Payments Expected Year Five | 70
Payments Expected Thereafter | 309
Total Estimated Future Benefit Payments | 677
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 12
Payments Expected Year Two | 14
Payments Expected Year Three | 17
Payments Expected Year Four | 19
Payments Expected Year Five | 22
Payments Expected Thereafter | 149
Total Estimated Future Benefit Payments | 233
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 10
Payments Expected Year Two | 12
Payments Expected Year Three | 14
Payments Expected Year Four | 15
Payments Expected Year Five | 17
Payments Expected Thereafter | 112
Total Estimated Future Benefit Payments | $ 180

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