Pension, OPEB and Savings Plans (Assumptions Used To Determine The Benefit Obligations And Net Periodic Benefit Costs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.20%	5.00%	4.20%
Expected Return on Plan Assets	8.00%	8.00%	8.00%
Rate of Compensation Increase	3.61%	4.61%	4.61%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	4.61%	4.61%	4.61%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.00%	4.20%	5.00%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.21%	5.01%	4.20%
Expected Return on Plan Assets	8.00%	8.00%	8.00%
Rate of Compensation Increase	3.61%	4.61%	4.61%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	4.61%	4.61%	4.61%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.01%	4.20%	5.00%
Administrative Expense	3.00%	3.00%	3.00%
Total of Service Cost and Interest Cost	13	12	12
Postretirement Benefit Obligation	201	161	180
Total of Service Cost and Interest Cost	(10)	(9)	(9)
Postretirement Benefit Obligation	(165)	(134)	(149)
Other Benefits [Member] \| Dental Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Immediate Rate	5.25%	5.50%	6.00%
Ultimate Rate	5.00%	5.00%	6.00%
Year Ultimate Rate Reached	2016	2016	2013
Other Benefits [Member] \| Pre-65 Medical Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Immediate Rate	7.50%	8.00%	8.88%
Ultimate Rate	5.00%	5.00%	5.00%
Year Ultimate Rate Reached	2022	2021	2023
Other Benefits [Member] \| Post-65 Medical Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Immediate Rate	7.25%	7.88%	7.98%
Ultimate Rate	5.00%	5.00%	5.00%
Year Ultimate Rate Reached	2022	2021	2019
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.50%
Expected Return on Plan Assets	7.70%
Rate of Compensation Increase	3.25%
Administrative Expense	5.00%
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Pension Benefits [Member] \| Dental Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Immediate Rate	8.00%
Ultimate Rate	5.00%
Year Ultimate Rate Reached	2018
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Pension Benefits [Member] \| Pre-65 Medical Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Immediate Rate	7.50%
Ultimate Rate	5.00%
Year Ultimate Rate Reached	2022
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Pension Benefits [Member] \| Post-65 Medical Costs [Member]
Defined Benefit Plan Disclosure [Line Items]
Immediate Rate	7.44%
Ultimate Rate	5.00%
Year Ultimate Rate Reached	2022
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.60%
Rate of Compensation Increase	3.25%
Postretirement Benefit Obligation	160
Postretirement Benefit Obligation	(106)

Administrative Expense

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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- Definition

The interest rate used to adjust for the time value of money.

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ 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 (l)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

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- Definition

The ultimate trend rate for health care costs.

+ References

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- Definition

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ References

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