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Pensions Benefit Plans and Other Postretirement Benefits - Reconciliation of Pension Plan Assets Using Significant Unobservable Inputs (Details) - Level 3 - Pension Benefit Plans $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure |
Fair value at beginning of year | $ 10
Net increase (decrease) | $ (10)

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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 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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- Definition Amount of increase (decrease) in plan assets of defined benefit plan. + References No definition available. + Details
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- Details
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- Details
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