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Benefit Plans (Termination, Settlement and Curtailment Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Termination, settlement, and curtailment costs |  | $ 27 |
Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation | $ 0 | 23 | $ 0
Net loss | 86 | 9 | 8
Prior service cost (credit) | 0 | 2 | 0
Termination, settlement, and curtailment costs | 86 | 34 | 8
Postretirement Benefit Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation |  | 11 |
Net loss |  | 0 |
Prior service cost (credit) |  | (13) |
Termination, settlement, and curtailment costs | $ 0 | $ (2) | $ 0

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- Definition Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments, Benefit Obligation + References No definition available. + Details
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- Definition Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments, Net Losses + References No definition available. + Details
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- Definition Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments, Prior Service Cost (Credit) + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment. + 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 (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Details
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- Details
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