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Benefit Plans (Fair Values of Pension Plan Assets) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | $ 8,015 | $ 7,475
U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 588 | 444
U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. municipal bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 81 | 102
U.S. And Foreign Government Securities Or Their Agencies [Member] | Foreign government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 150 | 185
Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 1,789 | 1,735
Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 511 | 602
Common Stock [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 1,396 | 1,076
Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 831 | 760
Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 194 | 188
Plan Asset Categories, Excluding Investments Measured at NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 5,540 | 5,092
Common/Collective Trusts [Member] | U.S. large cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 2,014 | 1,940
Common/Collective Trusts [Member] | U.S. small cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 361 | 363
Common/Collective Trusts [Member] | International developed markets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 100 | 80
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] |  |
Fair value of plan assets, net | 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] |  |
Fair value of plan assets, net | 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] |  |
Fair value of plan assets, net | 0 | 0
Level 1 [Member] | Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 0 | 0
Level 1 [Member] | Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 0 | 0
Level 1 [Member] | Common Stock [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 1,396 | 1,076
Level 1 [Member] | Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 831 | 760
Level 1 [Member] | Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 120 | 142
Level 1 [Member] | Plan Asset Categories, Excluding Investments Measured at NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 2,347 | 1,978
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] |  |
Fair value of plan assets, net | 588 | 444
Level 2 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | U.S. municipal bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 81 | 102
Level 2 [Member] | U.S. And Foreign Government Securities Or Their Agencies [Member] | Foreign government and agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 150 | 185
Level 2 [Member] | Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 1,789 | 1,735
Level 2 [Member] | Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 511 | 602
Level 2 [Member] | Common Stock [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 0 | 0
Level 2 [Member] | Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 0 | 0
Level 2 [Member] | Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 74 | 33
Level 2 [Member] | Plan Asset Categories, Excluding Investments Measured at NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 3,193 | 3,101
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] |  |
Fair value of plan assets, net | 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] |  |
Fair value of plan assets, net | 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] |  |
Fair value of plan assets, net | 0 | 0
Level 3 [Member] | Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 0 | 0
Level 3 [Member] | Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 0 | 0
Level 3 [Member] | Common Stock [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 0 | 0
Level 3 [Member] | Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 0 | 0
Level 3 [Member] | Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 0 | 13
Level 3 [Member] | Plan Asset Categories, Excluding Investments Measured at NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | $ 0 | $ 13

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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