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Benefit Plans (Fair Values of Pension Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | $ 7,475 | $ 6,706
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 | 444 | 331
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 | 102 | 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 | 185 | 252
Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 1,735 | 1,660
Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 602 | 502
Common Stock [Member] | International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 1,076 | 909
Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 760 | 605
Registered Investment Companies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 51 | 58
Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 137 | 87
Plan Asset Categories, Excluding Investments Measured at NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 5,092 | 4,506
Common/Collective Trusts [Member] | U.S. large cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 1,940 | 1,762
Common/Collective Trusts [Member] | U.S. small cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 363 | 360
Common/Collective Trusts [Member] | International developed markets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 80 | 78
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 | 1,076 | 907
Level 1 [Member] | Common Stock [Member] | U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 760 | 605
Level 1 [Member] | Registered Investment Companies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 51 | 58
Level 1 [Member] | Other, Net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 91 | 16
Level 1 [Member] | Plan Asset Categories, Excluding Investments Measured at NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 1,978 | 1,586
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 | 444 | 331
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 | 102 | 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 | 185 | 252
Level 2 [Member] | Corporate Debt Instruments [Member] | Above investment grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 1,735 | 1,660
Level 2 [Member] | Corporate Debt Instruments [Member] | Below grade investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 602 | 502
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] | Registered Investment Companies [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 | 33 | 58
Level 2 [Member] | Plan Asset Categories, Excluding Investments Measured at NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, net | 3,101 | 2,905
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 | 2
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] | Registered Investment Companies [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 | 13 | 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 | $ 13 | $ 15

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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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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