Retirement Benefits - Assumptions Used in Calculations (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Discount rate - Benefit Obligation	5.19%	5.53%
Benefit Obligation Investment Crediting Rate	5.03%	5.07%
Discount rate - Net Periodic Benefit Costs	5.53%	3.24%	2.58%
Net Periodic Benefit Cost Investment Crediting Rate	5.07%	3.75%	3.72%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.00%	7.00%	7.00%
Pension Plan, Defined Benefit [Member] | CENG Legacy Benefit Plans [Member] | Minimum
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes	5.11%	5.46%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes	5.46%	2.55%	2.11%
Pension Plan, Defined Benefit [Member] | CENG Legacy Benefit Plans [Member] | Maximum
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes	5.27%	5.60%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes	5.60%	3.24%	2.73%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Discount rate - Benefit Obligation	5.17%	5.51%
Health care cost trend rate	5.00%	5.00%
Ultimate health care cost trend rate	5.00%	5.00%
Discount rate - Net Periodic Benefit Costs	5.51%	3.20%	2.51%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6.50%	6.44%	6.46%
Other Postretirement Benefit Plan, Defined Benefit [Member] | CENG Legacy Benefit Plans [Member] | Minimum
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes	5.15%	5.49%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes	5.49%	2.84%	2.45%
Other Postretirement Benefit Plan, Defined Benefit [Member] | CENG Legacy Benefit Plans [Member] | Maximum
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Design Changes	5.17%	5.51%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Design Changes	5.51%	3.20%	2.63%
Pension and other post retirement benefit [Member]
Defined Benefit Plan Assumptions Used In Calculations [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.75%	3.75%	3.75%