Retirement Plans, Asset Allocation for Pension Plan Table (Details) - RAP	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total	55.00%	53.00%
Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Total	34.00%	33.00%
Group annuity contracts
Defined Benefit Plan Disclosure [Line Items]
Total	10.00%	11.00%
Alternative securities
Defined Benefit Plan Disclosure [Line Items]
Total	0.00%	1.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Total	1.00%	2.00%