Retirement Benefits - Schedule of Actuarial Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Qualified Defined  Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate	5.375%	5.625%	5.00%
Expected long-term rate of return on assets	6.50%	6.50%	6.50%
Retiree Medical and Life Insurance Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted average discount rate	5.25%	5.50%	5.00%
Expected long-term rate of return on assets	6.50%	6.50%	6.50%
Health care trend rate assumed for next year	8.25%	8.50%	8.00%
Ultimate health care trend rate	4.50%	4.50%	4.50%