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Pension, OPEB and Savings Plans (Estimated Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2016 USD ($)
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Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | $ 310
Payments Expected Year Two | 307
Payments Expected Year Three | 319
Payments Expected Year Four | 331
Payments Expected Year Five | 343
Payments Expected Thereafter | 1,887
Total Estimated Future Benefit Payments | 3,497
Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 82
Payments Expected Year Two | 86
Payments Expected Year Three | 90
Payments Expected Year Four | 94
Payments Expected Year Five | 99
Payments Expected Thereafter | 534
Total Estimated Future Benefit Payments | 985
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 2
Payments Expected Year Two | 3
Payments Expected Year Three | 5
Payments Expected Year Four | 7
Payments Expected Year Five | 8
Payments Expected Thereafter | 76
Total Estimated Future Benefit Payments | 101
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 | 9
Payments Expected Year Four | 11
Payments Expected Year Five | 13
Payments Expected Thereafter | 96
Total Estimated Future Benefit Payments | $ 139

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- Definition Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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