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Benefit Plans (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2020 USD ($)
Pension [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, plan assets, contributions by employer | $ 4,000,000
Pension [Member] | Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Anticipated additional employer contributions | 25,000,000
Postretirement [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, plan assets, contributions by employer | 0
Postretirement [Member] | Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Anticipated additional employer contributions | $ 60,000,000

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