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Employee Benefit Plans (Target and Actual Asset Allocations) (Details) | Dec. 31, 2023 | Dec. 31, 2022
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Master Trust |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 100.00% |
Actual asset allocation | 100.00% | 100.00%
Master Trust | Global equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 45.00% |
Actual asset allocation | 45.00% | 49.00%
Master Trust | Global private equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 2.00% |
Actual asset allocation | 2.00% | 2.00%
Master Trust | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 35.00% |
Actual asset allocation | 35.00% | 30.00%
Master Trust | Return seeking debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 7.00% |
Actual asset allocation | 6.00% | 7.00%
Master Trust | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 4.00% |
Actual asset allocation | 4.00% | 6.00%
Master Trust | Real estate and cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 7.00% |
Actual asset allocation | 8.00% | 6.00%
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 100.00% |
Actual asset allocation | 100.00% | 100.00%
OPEB | U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 29.00% |
Actual asset allocation | 30.00% | 12.00%
OPEB | Non-U.S. equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 15.00% |
Actual asset allocation | 15.00% | 5.00%
OPEB | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 47.00% |
Actual asset allocation | 30.00% | 11.00%
OPEB | Real estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 5.00% |
Actual asset allocation | 7.00% | 3.00%
OPEB | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 4.00% |
Actual asset allocation | 18.00% | 69.00%
Other Post-Retirement Benefit Plans | Master Trust |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 100.00% |
Actual asset allocation | 100.00% | 100.00%
Other Post-Retirement Benefit Plans | Master Trust | Global equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 14.00% |
Actual asset allocation | 14.00% | 14.00%
Other Post-Retirement Benefit Plans | Master Trust | Global private equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 1.00% |
Other Post-Retirement Benefit Plans | Master Trust | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 80.00% |
Actual asset allocation | 79.00% | 80.00%
Other Post-Retirement Benefit Plans | Master Trust | Return seeking debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 2.00% |
Actual asset allocation | 2.00% | 2.00%
Other Post-Retirement Benefit Plans | Master Trust | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 1.00% |
Actual asset allocation | 2.00% | 2.00%
Other Post-Retirement Benefit Plans | Master Trust | Real estate and cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percent) | 2.00% |
Actual asset allocation | 3.00% | 2.00%

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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