XML 102 R86.htm IDEA: XBRL DOCUMENT v3.20.4
Share-based Compensation and Employee Benefits - Schedule of Weighted-Average Actuarial Assumptions (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits      
Assumptions related to benefit obligations:      
Discount rate 2.27% 3.17% 4.26%
Rate of compensation increase 3.50% 3.50% 3.50%
Interest crediting rate 2.57% 3.71% 3.90%
Assumptions related to benefit costs:      
Expected return on plan assets 6.75% 7.25% 7.25%
Rate of compensation increase 3.50% 3.50% 3.50%
Interest crediting rate 3.71% 3.90% 2.71%
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
UBIT rate 27.00% 27.00% 21.00%
Assumptions related to benefit obligations:      
Discount rate 2.08% 3.03% 4.16%
Assumptions related to benefit costs:      
Expected return on plan assets 6.50% 6.50% 7.08%
Benefit obligation | Pension Benefits      
Assumptions related to benefit costs:      
Discount rate 3.17% 4.26% 3.56%
Benefit obligation | OPEB      
Assumptions related to benefit costs:      
Discount rate 3.03% 4.16% 3.48%
Discount rate for interest on benefit obligations | Pension Benefits      
Assumptions related to benefit costs:      
Discount rate 2.71% 3.89% 3.13%
Discount rate for interest on benefit obligations | OPEB      
Assumptions related to benefit costs:      
Discount rate 2.63% 3.83% 3.08%
Discount rate for service cost | Pension Benefits      
Assumptions related to benefit costs:      
Discount rate 3.24% 4.28% 3.56%
Discount rate for service cost | OPEB      
Assumptions related to benefit costs:      
Discount rate 3.48% 4.51% 3.82%
Discount rate for interest on service cost | Pension Benefits      
Assumptions related to benefit costs:      
Discount rate 2.80% 3.93% 3.14%
Discount rate for interest on service cost | OPEB      
Assumptions related to benefit costs:      
Discount rate 3.39% 4.46% 3.76%