XML 114 R99.htm IDEA: XBRL DOCUMENT v3.22.0.1
Pensions and Other Postretirement Plans (Key Assumptions - Cost) (Details 6) - Periodic Cost [Member]
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate (percent) 2.50% 3.30% 4.30%
Expected return on plan assets (percent) 6.25% 6.25% 6.25%
Cash balance interest crediting rate 1.41% 2.77% 3.45%
Ultimate cash balance interest crediting rate 2.50% 3.30% 4.30%
Year that reaches ultimate cash balance interest crediting rate 2023 2022 2021
Pension Plans [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 1.00% 1.00% 1.00%
Pension Plans [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 5.00% 5.00% 5.00%
Supplemental Executive Retirement Plan (SERP) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate (percent) 2.50% 3.30% 4.30%
Expected return on plan assets (percent) 0.00% 0.00% 0.00%
Cash balance interest crediting rate 0.00% 0.00% 0.00%
Supplemental Executive Retirement Plan (SERP) [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 1.00% 1.00% 1.00%
Supplemental Executive Retirement Plan (SERP) [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase (percent) 5.00% 5.00% 5.00%