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Pension, OPEB and Savings Plans (Estimated Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | $ 389
Payments Expected Year Two | 368
Payments Expected Year Three | 381
Payments Expected Year Four | 392
Payments Expected Year Five | 401
Payments Expected Thereafter | 2,119
Total Estimated Future Benefit Payments | 4,050
Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 83
Payments Expected Year Two | 84
Payments Expected Year Three | 84
Payments Expected Year Four | 84
Payments Expected Year Five | 83
Payments Expected Thereafter | 388
Total Estimated Future Benefit Payments | 806
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 8
Payments Expected Year Two | 10
Payments Expected Year Three | 12
Payments Expected Year Four | 15
Payments Expected Year Five | 17
Payments Expected Thereafter | 123
Total Estimated Future Benefit Payments | 185
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 9
Payments Expected Year Two | 11
Payments Expected Year Three | 13
Payments Expected Year Four | 15
Payments Expected Year Five | 17
Payments Expected Thereafter | 111
Total Estimated Future Benefit Payments | $ 176

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