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Employee Benefit Plans (Schedule Of Fair Value Of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | $ 1,922 | $ 2,194
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 875 | 796
Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 1,047 | 1,398
Common stock - U.S. companies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 196 | 180
Common stock - U.S. companies [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 196 | 180
Common stock - International companies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 8 | 6
Common stock - International companies [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 8 | 6
Equity mutual funds - Emerging markets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 58 | 62
Equity mutual funds - Emerging markets [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 58 | 62
Equity mutual funds - International [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 105 | 91
Equity mutual funds - International [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 105 | 91
Equity mutual funds - Large cap U.S. [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 409 | 362
Equity mutual funds - Large cap U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 409 | 362
Common collective trust funds - International equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 278 | 370
Common collective trust funds - International equity [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 278 | 370
Common collective trust funds - Large cap U.S. equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 45 | 33
Common collective trust funds - Large cap U.S. equity [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 45 | 33
Common collective trust funds - Fixed income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 193 | 500
Common collective trust funds - Fixed income [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 193 | 500
Common collective trust funds - Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 47 | 35
Common collective trust funds - Other [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 47 | 35
Debt instruments - Corporate bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 457 | 422
Debt instruments - Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 457 | 422
Debt instruments - U.S. Treasury instruments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 99 | 95
Debt instruments - U.S. Treasury instruments [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 99 | 95
Debt instruments - U.S. government agency, state and local government bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 24 | 37
Debt instruments - U.S. government agency, state and local government bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 24 | 37
Other Debt Instruments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | 3 | 1
Other Debt Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets at fair value | $ 3 | $ 1

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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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