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Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Assumptions Used) (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Pension Benefits |  |
Weighted average assumptions used in benefit obligations: |  |
Discount rate | 2.50% | 3.25%
Weighted average assumptions used in net periodic benefit costs: |  |
Discount rate | 3.25% | 4.25%
Expected long-term rate of return on assets | 4.53% | 4.69%
Other Postretirement Benefits |  |
Weighted average assumptions used in benefit obligations: |  |
Discount rate | 1.75% | 2.75%
Weighted average assumptions used in net periodic benefit costs: |  |
Discount rate | 2.75% | 3.75%
Expected long-term rate of return on assets | 0.00% | 0.00%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation 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 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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