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Benefit Plans (Effects of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates) (Details) - Postretirement Benefit Plan [Member] | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Effect on total of service and interest cost, One-Percentage-Point Increase | 7.80%
Effect on total of service and interest cost, One-Percentage-Point Decrease | (6.90%)
Effect on postretirement benefit obligation, One-Percentage-Point Increase | 6.60%
Effect on postretirement benefit obligation, One-Percentage-Point Decrease | (5.50%)

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- Definition Defined Benefit Plan Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation Percentage + References No definition available. + Details
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- Definition Defined Benefit Plan Effect of One Percentage Point Decrease on Service and Interest Cost Components Percentage + References No definition available. + Details
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- Definition Defined Benefit Plan Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Percentage + References No definition available. + Details
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- Definition Defined Benefit Plan Effect of One Percentage Point Increase on Service and Interest Cost Components Percentage + 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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- Details
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