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Benefit Plans (Fair Values of Pension Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | $ 6,706 | $ 7,297
Common/Collective Trusts [Member] | U.S. large cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 1,762 | 1,870
Common/Collective Trusts [Member] | U.S. small cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 360 | 442
Common/Collective Trusts [Member] | International developed markets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 78 | 79
U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 331 | 296
U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. municipal bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 102 | 124
U.S. And Foreign Government Securities Or Their Agencies [Member] | Foreign government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 252 | 281
Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 1,660 | 1,765
Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 502 | 527
Common Stock [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 909 | 1,001
Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 605 | 556
Registered Investment Companies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 58 | 176
Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 87 | 180
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 1,586 | 1,693
Level 1 [Member] | Common/Collective Trusts [Member] | U.S. large cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 [Member] | Common/Collective Trusts [Member] | U.S. small cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 [Member] | Common/Collective Trusts [Member] | International developed markets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. municipal bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | Foreign government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 [Member] | Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 [Member] | Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 [Member] | Common Stock [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 907 | 1,000
Level 1 [Member] | Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 605 | 556
Level 1 [Member] | Registered Investment Companies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 58 | 63
Level 1 [Member] | Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 16 | 74
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 5,105 | 5,588
Level 2 [Member] | Common/Collective Trusts [Member] | U.S. large cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 1,762 | 1,870
Level 2 [Member] | Common/Collective Trusts [Member] | U.S. small cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 360 | 442
Level 2 [Member] | Common/Collective Trusts [Member] | International developed markets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 78 | 79
Level 2 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 331 | 296
Level 2 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. municipal bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 102 | 124
Level 2 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | Foreign government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 252 | 281
Level 2 [Member] | Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 1,660 | 1,765
Level 2 [Member] | Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 502 | 527
Level 2 [Member] | Common Stock [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 2 [Member] | Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 2 [Member] | Registered Investment Companies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 113
Level 2 [Member] | Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 58 | 91
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 15 | 16
Level 3 [Member] | Common/Collective Trusts [Member] | U.S. large cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | Common/Collective Trusts [Member] | U.S. small cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | Common/Collective Trusts [Member] | International developed markets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. municipal bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | Foreign government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | Common Stock [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 2 | 1
Level 3 [Member] | Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | Registered Investment Companies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | 0 | 0
Level 3 [Member] | Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Investments at fair value | $ 13 | $ 15

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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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