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Pension, OPEB and Savings Plans (Estimated Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | $ 382
Payments Expected Year Two | 354
Payments Expected Year Three | 367
Payments Expected Year Four | 378
Payments Expected Year Five | 389
Payments Expected Thereafter | 2,074
Total Estimated Future Benefit Payments | 3,944
Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 90
Payments Expected Year Two | 85
Payments Expected Year Three | 86
Payments Expected Year Four | 86
Payments Expected Year Five | 86
Payments Expected Thereafter | 409
Total Estimated Future Benefit Payments | 842
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 6
Payments Expected Year Two | 8
Payments Expected Year Three | 10
Payments Expected Year Four | 12
Payments Expected Year Five | 14
Payments Expected Thereafter | 109
Total Estimated Future Benefit Payments | 159
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 7
Payments Expected Year Two | 9
Payments Expected Year Three | 11
Payments Expected Year Four | 13
Payments Expected Year Five | 15
Payments Expected Thereafter | 104
Total Estimated Future Benefit Payments | $ 159

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