Pension and OPEB Pension And OPEB (Estimated Future Benefit Payments Servco) (Details) (Long Island ServCo [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2014	$ 0
2015	0
2016	1
2017	2
2018	3
2019-2023	37
Defined Benefit Plan Expected Future Benefit Payments Total	43
OPEB [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2014	1
2015	3
2016	4
2017	6
2018	8
2019-2023	65
Defined Benefit Plan Expected Future Benefit Payments Total	$ 87

Defined Benefit Plan Expected Future Benefit Payments Total

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- Definition

Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

+ 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=28361610&loc=d3e1928-114920

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- Definition

Amount of benefits expected to be paid in the remainder of the fiscal year following the latest fiscal year ended from a defined benefit plan.

+ References

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Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

+ References

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- Definition

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

+ References

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Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

+ References

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

+ References

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