Pension, OPEB and Savings Plans (Estimated Future Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	$ 282
2016	283
2017	294
2018	305
2019	318
2020-2024	1,770
Total Estimated Future Benefit Payments	3,252
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	79
2016	82
2017	84
2018	87
2019	90
2020-2024	495
Total Estimated Future Benefit Payments	917
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	0
2016	1
2017	2
2018	3
2019	4
2020-2024	49
Total Estimated Future Benefit Payments	59
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	2
2016	4
2017	6
2018	7
2019	9
2020-2024	74
Total Estimated Future Benefit Payments	$ 102

Defined Benefit Plan Expected Future Benefit Payments Total

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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=35743120&loc=d3e1928-114920

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Amount of benefits from a defined benefit plan expected to be paid in the next 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

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+ References

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Amount of benefits from a defined benefit plan expected to be paid in the fourth 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.

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Amount of benefits from a defined benefit plan expected to be paid in the third 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

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Amount of benefits from a defined benefit plan expected to be paid in the second 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.

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