Employee Benefits, Weighted-Average Assumptions Used to Determine Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate (percent)	2.30%	1.70%
Expected return on plan assets (percent)	6.25%	6.50%
Rate of compensation increase (percent)	3.00%	3.00%
SRP
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate (percent)	2.35%	1.55%
Expected return on plan assets (percent)	6.25%	6.50%
Rate of compensation increase (percent)	3.00%	3.00%
PBOP
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate (percent)	2.90%	2.60%
Expected return on plan assets (percent)	2.01%	2.81%