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Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018
Pension [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Additional employer contributions |  | $ 11
Pension [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Anticipated additional employer contributions |  | 30
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution by employer | $ 270 |
Other Postretirement Benefits Plan [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Anticipated additional employer contributions |  | $ 70

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- Definition Defined Benefit Plan, Additional Contributions by Employer + 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 contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Details
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- Details
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- Details
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