XML 128 R97.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Retirement Benefits (Schedule Of Assumptions Used) (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DB Pension Plans      
Weighted average for net periodic benefit cost      
Expected long-term rate of return on plan assets 7.00% 7.00% 7.25%
Actual rate of return on plan assets 21.00% (6.70%) 18.00%
DB SERP      
Weighted average for benefit obligations      
Discount rate 3.15% 4.32% 3.65%
Rate of compensation increase 5.50% 5.50% 5.50%
Weighted average for net periodic benefit cost      
Service cost discount rate 4.58% 3.83% 4.51%
Interest cost discount rate 3.94% 3.26% 3.51%
Rate of compensation increase 5.50% 5.50% 5.50%
OPEB Plan      
Weighted average for benefit obligations      
Discount rate 3.32% 4.42% 3.74%
Weighted average for net periodic benefit cost      
Service cost discount rate 4.63% 3.93% 4.89%
Interest cost discount rate 4.03% 3.35% 3.79%
Expected long-term rate of return on plan assets 7.00% 7.00% 7.25%
Pension Plan A | DB Pension Plans      
Weighted average for benefit obligations      
Discount rate 3.37% 4.48% 3.78%
Rate of compensation increase 3.50% 3.50% 3.50%
Weighted average for net periodic benefit cost      
Service cost discount rate 4.55% 3.85%  
Interest cost discount rate 4.08% 3.39%  
Rate of compensation increase 3.50% 3.50%  
Pension Plan B | DB Pension Plans      
Weighted average for benefit obligations      
Discount rate 3.17% 4.32% 3.64%
Weighted average for net periodic benefit cost      
Service cost discount rate     4.53%
Interest cost discount rate 3.93% 3.24% 3.56%
Rate of compensation increase     3.60%