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Pension, OPEB and Savings Plans (Estimated Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | $ 345
Payments Expected Year Two | 341
Payments Expected Year Three | 352
Payments Expected Year Four | 364
Payments Expected Year Five | 373
Payments Expected Thereafter | 2,004
Total Estimated Future Benefit Payments | 3,779
Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 91
Payments Expected Year Two | 95
Payments Expected Year Three | 87
Payments Expected Year Four | 88
Payments Expected Year Five | 89
Payments Expected Thereafter | 428
Total Estimated Future Benefit Payments | 878
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 4
Payments Expected Year Two | 6
Payments Expected Year Three | 7
Payments Expected Year Four | 9
Payments Expected Year Five | 11
Payments Expected Thereafter | 91
Total Estimated Future Benefit Payments | 128
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other 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 | 99
Total Estimated Future Benefit Payments | $ 149

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