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Pension, OPEB and Savings Plans (Fair Value Measurements And The Levels Of Inputs Used In Determining Fair Values) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 5,413 |  | $ 5,654 |  |
Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 103 |  | 153 |  |
Common Stocks Commingled - US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 1,980 |  | 2,292 |  |
Common Stocks Commingled - International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 987 |  | 1,005 |  |
Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 816 |  | 727 |  |
Government (US & Foreign) Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 602 |  | 509 |  |
Other Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 906 |  | 943 |  |
Private Equity [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 19 |  | 25 |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,885 |  | 4,116 |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 102 |  | 92 |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Common Stocks Commingled - US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 1,980 |  | 2,292 |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Common Stocks Commingled - International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 987 |  | 1,005 |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 816 |  | 727 |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Government (US & Foreign) Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0 |  | 0 |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Other Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0 |  | 0 |  |
Quoted Market Prices for Identical Assets (Level 1) [Member] | Private Equity [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0 |  | 0 |  |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 1,509 |  | 1,513 |  |
Significant Other Observable Inputs (Level 2) [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 1 |  | 61 |  |
Significant Other Observable Inputs (Level 2) [Member] | Common Stocks Commingled - US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Significant Other Observable Inputs (Level 2) [Member] | Common Stocks Commingled - International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Significant Other Observable Inputs (Level 2) [Member] | Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Significant Other Observable Inputs (Level 2) [Member] | Government (US & Foreign) Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 602 |  | 509 |  |
Significant Other Observable Inputs (Level 2) [Member] | Other Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 906 |  | 943 |  |
Significant Other Observable Inputs (Level 2) [Member] | Private Equity [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0 |  | 0 |  |
Pension And OPEB Plans Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 19 |  | 25 |  |
Pension And OPEB Plans Level 3 [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 0 |  | 0 |  |
Pension And OPEB Plans Level 3 [Member] | Common Stocks Commingled - US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Pension And OPEB Plans Level 3 [Member] | Common Stocks Commingled - International [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Pension And OPEB Plans Level 3 [Member] | Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 0 |  | 0 |  |
Pension And OPEB Plans Level 3 [Member] | Government (US & Foreign) Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0 |  | 0 |  |
Pension And OPEB Plans Level 3 [Member] | Other Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 0 |  | 0 |  |
Pension And OPEB Plans Level 3 [Member] | Private Equity [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 19 | [3] | 25 | [3] | $ 25
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 97 |  | 69 |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4] | 0 |  | 1 |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Common Stocks Commingled - US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [5] | 68 |  | 48 |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [6] | 29 |  | 20 |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 68 |  | 48 |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 | [4] |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] | Common Stocks Commingled - US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 68 |  | 48 | [5] |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Quoted Market Prices for Identical Assets (Level 1) [Member] | Other Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 | [6] |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 29 |  | 21 |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 1 | [4] |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Significant Other Observable Inputs (Level 2) [Member] | Common Stocks Commingled - US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 | [5] |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 29 |  | 20 | [6] |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension And OPEB Plans Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |  |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension And OPEB Plans Level 3 [Member] | Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 | [4] |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension And OPEB Plans Level 3 [Member] | Common Stocks Commingled - US [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 | [5] |
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension And OPEB Plans Level 3 [Member] | Other Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 0 |  | $ 0 | [6] |
[1] | Certain open-ended mutual funds with mainly short-term investments are valued based on unadjusted quoted prices in active market (Level 1). Certain temporary investments are valued using inputs such as time-to-maturity, coupon rate, quality rating and current yield (Level 2).
[2] | Wherever possible, fair values of equity investments in stocks and in commingled funds are derived from quoted market prices as substantially all of these instruments have active markets (primarily Level 1). Most investments in stocks are priced utilizing the principal market close price or in some cases midpoint, bid or ask price.
[3] | Investments in fixed income securities including bond funds are priced using an evaluated pricing approach or the most recent exchange or quoted bid (primarily Level 2).
[4] | Certain temporary investments are valued using inputs such as time-to-maturity, coupon rate, quality rating and current yield (Level 2).
[5] | Wherever possible, fair values of equity investments in commingled stock funds are derived from quoted market prices as substantially all of these instruments have active markets (primarily Level 1). Most investments in stocks are priced utilizing the principal market close price or in some cases midpoint, bid or ask price.
[6] | Investments in fixed income securities including bond funds are priced using an evaluated pricing approach or the most recent exchange or quoted bid (primarily Level 2).

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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