Pension and Other Post-Retirement Benefits - Assumed Health Care Cost Trend Rates (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Post Age 65	6.25%	5.75%
Medical Claims [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Pre Age 65	6.75%	6.40%
Review of historical returns
Rate to which the cost trend is expected to decline (the ultimate trend rate)	4.50%	4.50%
Year that rate reaches the ultimate trend rate	2033	2032
Prescription Drugs Claims [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Pre Age 65	8.25%	7.50%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Post Age 65	8.25%	7.50%
Review of historical returns
Rate to which the cost trend is expected to decline (the ultimate trend rate)	4.50%	4.50%
Year that rate reaches the ultimate trend rate	2033	2031
Medicare Advantage Part D
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Post Age 65	17.95%	16.25%