Retirement Benefits Plan Assumptions (Details 5)	12 Months Ended
	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Benefit Obligation [Member]
Defined Benefit Plan Disclosure (Table Amounts)
Initial health care cost trend rate assumed for the next year		6.50%	5.90%	6.20%
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate)		5.00%	5.00%	5.00%
Year that the health care cost trend rate reaches the ultimate trend rate		2031	2028	2028
Pension Benefits
Assumptions Used to Determine Benefit Obligation
Discount rate		5.58%	5.73%	5.15%
Initial cash balance crediting rate assumed for the next year		4.84%	4.78%	4.02%
Rate to which the cash balance crediting rate is assumed to increase/decrease (the ultimate rate)		5.26%	4.90%	4.02%
Year that the cash balance crediting rate reaches the ultimate rate		2031	2030	2029
Rate of compensation increase		3.00%	3.00%	3.00%
Assumptions Used to Determine Benefit Cost
Discount rate		5.73%	5.15%
Expected long-term return on plan assets		7.50%	7.50%
Initial cash balance crediting rate assumed for the next year		4.78%	4.02%
Rate to which the cash balance crediting rate is assumed to increase (the ultimate rate)		4.90%	4.02%
Year that the cash balance crediting rate reaches the ultimate rate		2030	2029
Rate of compensation increase		3.00%	3.00%
Pension Benefits | Subsequent Event [Member]
Assumptions Used to Determine Benefit Cost
Discount rate	5.58%
Expected long-term return on plan assets	7.50%
Initial cash balance crediting rate assumed for the next year	4.84%
Rate to which the cash balance crediting rate is assumed to increase (the ultimate rate)	5.26%
Year that the cash balance crediting rate reaches the ultimate rate	2031
Rate of compensation increase	3.00%
Post-retirement Benefit Cost [Member]
Defined Benefit Plan Disclosure (Table Amounts)
Initial health care cost trend rate assumed for the next year		5.90%	6.20%
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate)		5.00%	5.00%
Year that the health care cost trend rate reaches the ultimate trend rate		2028	2028
Post-retirement Benefit Cost [Member] | Subsequent Event [Member]
Defined Benefit Plan Disclosure (Table Amounts)
Initial health care cost trend rate assumed for the next year	6.50%
Rate to which the health care cost trend rate is assumed to decline (the ultimate trend rate)	5.00%
Year that the health care cost trend rate reaches the ultimate trend rate	2031
Medical and Life Benefits
Assumptions Used to Determine Benefit Obligation
Discount rate		5.41%	5.69%	5.20%
Assumptions Used to Determine Benefit Cost
Discount rate		5.69%	5.20%
Expected long-term return on plan assets		7.08%	7.12%
Medical and Life Benefits | Subsequent Event [Member]
Assumptions Used to Determine Benefit Cost
Discount rate	5.41%
Expected long-term return on plan assets	7.10%