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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Weighted Average Assumptions Used to Determine the Net Periodic Cost (Benefit) for Non-Deltic and Deltic Plans) (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Plans [Member] | Non-Deltic Plans [Member] |  |  |
Discount rate | 3.40% | 4.40% | 3.85%
Expected return on plan assets | 5.75% | 6.25% | 6.25%
Rate of salaried compensation increase | 3.00% | 3.00% | 3.00%
Pension Plans [Member] | Deltic Plans [Member] |  |  |
Discount rate | 3.40% | 4.40% | 4.30%
Expected return on plan assets | 5.75% | 6.25% | 6.25%
Rate of salaried compensation increase | 4.00% | 4.00% | 4.00%
OPEB [Member] | Non-Deltic Plans [Member] |  |  |
Discount rate | 3.40% | 4.40% | 3.65%
OPEB [Member] | Deltic Plans [Member] |  |  |
Discount rate | 3.40% | 4.40% | 4.30%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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