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Benefit Plans (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Pension [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Additional employer contributions | $ 3
Pension [Member] | Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Anticipated additional employer contributions | 45
Postretirement [Member] | Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Anticipated additional employer contributions | $ 60

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- Definition Defined Benefit Plan, Additional Contributions by Employer + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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- Details
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- Details
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- Details
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