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Retirement Benefits - Plan Target and Actual Asset Allocation (Details)	Dec. 31, 2022	Dec. 31, 2021
Equity securities | All Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Target Mix	25.00%	26.00%
Actual Mix	25.00%	26.00%
Equity securities | Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Target Mix	28.00%	28.00%
Actual Mix	28.00%	29.00%
Fixed income securities | All Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Target Mix	57.00%	57.00%
Actual Mix	56.00%	58.00%
Fixed income securities | Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Target Mix	52.00%	52.00%
Actual Mix	52.00%	53.00%
Cash and other investments | All Pension Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Target Mix	18.00%	17.00%
Actual Mix	19.00%	16.00%
Cash and other investments | Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Target Mix	20.00%	20.00%
Actual Mix	20.00%	18.00%

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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