Pension, OPEB and Savings Plans (Assumptions Used To Determine The Benefit Obligations And Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.29%	4.54%	4.20%
Expected Return on Plan Assets	8.00%	8.00%	8.00%
Rate of Compensation Increase	3.61%	3.61%	3.61%
Service Cost Interest Rate	4.81%	4.20%	5.00%
Interest Cost Interest Rate	3.75%	4.20%	5.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.61%	3.61%	4.61%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.54%	4.20%	5.00%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.37%	4.58%	4.21%
Expected Return on Plan Assets	8.00%	8.00%	8.00%
Rate of Compensation Increase	3.61%	3.61%	3.61%
Service Cost Interest Rate	4.87%	4.21%	5.01%
Interest Cost Interest Rate	3.76%	4.21%	5.01%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.61%	3.61%	4.61%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.58%	4.21%	5.01%
Administrative Expense	3.00%	3.00%	3.00%
Immediate Rate	7.55%	7.75%	7.40%
Ultimate Rate	4.75%	4.75%	5.00%
Year Ultimate Rate Reached	2025	2025	2022
Total of Service Cost and Interest Cost effect of 1 percent increase	$ 11	$ 12	$ 13
Postretirement Benefit Obligation effect of 1 percent increase	191	194	201
Total of Service Cost and Interest Cost effect of 1 percent decrease	(9)	(10)	(10)
Postretirement Benefit Obligation effect of 1 percent decrease	$ (160)	$ (160)	$ (165)
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.61%	4.92%	4.50%
Expected Return on Plan Assets	7.70%
Rate of Compensation Increase	3.25%	3.25%	3.25%
Long Island Electric Utility Servco LLC Pension and OPEB [Member] \| Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.71%	4.97%	4.60%
Rate of Compensation Increase	3.25%	3.25%	3.25%
Administrative Expense	5.00%	5.00%	5.00%
Immediate Rate	7.55%	7.55%	7.33%
Ultimate Rate	4.75%	4.75%	5.00%
Year Ultimate Rate Reached	2025	2025	2021
Postretirement Benefit Obligation effect of 1 percent increase	$ 97	$ 75	$ 160
Postretirement Benefit Obligation effect of 1 percent decrease	$ (75)	$ (60)	$ (106)

Administrative Expense

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Interest Cost Interest Rate

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- Definition

The interest rate used to adjust for the time value of money for the 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 (k)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

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

+ 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 (k)(2)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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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
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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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.

+ 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 (m)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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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
-Glossary Health Care Cost Trend Rate
-URI http://asc.fasb.org/extlink&oid=6514820

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The ultimate trend rate for health care costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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-Paragraph 1
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