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Pension, OPEB and Savings Plans (Estimated Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | $ 337
Payments Expected Year Two | 331
Payments Expected Year Three | 341
Payments Expected Year Four | 352
Payments Expected Year Five | 364
Payments Expected Thereafter | 1,954
Total Estimated Future Benefit Payments | 3,679
Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 88
Payments Expected Year Two | 92
Payments Expected Year Three | 96
Payments Expected Year Four | 101
Payments Expected Year Five | 105
Payments Expected Thereafter | 560
Total Estimated Future Benefit Payments | 1,042
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 3
Payments Expected Year Two | 4
Payments Expected Year Three | 5
Payments Expected Year Four | 7
Payments Expected Year Five | 9
Payments Expected Thereafter | 78
Total Estimated Future Benefit Payments | 106
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 4
Payments Expected Year Two | 6
Payments Expected Year Three | 8
Payments Expected Year Four | 9
Payments Expected Year Five | 12
Payments Expected Thereafter | 87
Total Estimated Future Benefit Payments | $ 126

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