Pension, Postretirement And Other Employee Benefit Plans - Assumptions Used for Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Assumptions used to determine benefit obligations
Discount rate	5.04%	5.20%
Rate of compensation increase	3.84%	3.83%
Assumptions used to determine net expense
Discount rate	5.20%	2.90%
Expected return on plan assets	7.53%	7.16%
Rate of compensation increase	3.83%	3.83%
Other Postretirement Benefits
Assumptions used to determine benefit obligations
Discount rate	5.43%	5.66%
Assumptions used to determine net expense
Discount rate	5.66%	2.82%
Expected return on plan assets	3.00%	3.00%
Health care cost trend rate assumed for next year	7.00%	5.60%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2033)	4.50%	4.50%