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Employee Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2022
Weighted-Average Assumptions Used for Benefit Obligations This is a summary of the weighted-average assumptions used to determine our benefit obligations at December 31 for the plans:
 Qualified Pension PlanSERP
 2022202120222021
Discount rate5.34 %2.97 %5.42 %2.90 %
Rate of compensation increase4.50 
2.25-3.25
4.50 
2.25-3.25
Assumptions of Net Benefit Costs This is a summary of the weighted-average assumptions used to determine our net periodic benefit cost for the plans:
 Qualified Pension PlanSERP
 202220212020202220212020
Discount rate2.97 %2.68 %3.40 %2.90 %2.52 %3.33 %
Expected return on plan assets7.00 7.00 7.00 n/an/an/a
Rate of compensation increase
2.25-3.25
2.25-3.25
2.25-3.25
2.25-3.25
2.25-3.25
2.25-3.25
Benefit Obligation Activity Using An Actuarial Measurement Date For Qualified Plan And SERP Benefit obligation activity using an actuarial measurement date for our qualified pension plan and SERP at December 31 follows:
(Dollars in millions)At December 31,
20222021
Change in projected benefit obligation:  
Benefit obligation, January 1$362 $387 
Service cost9 10 
Interest cost10 10 
Actuarial gain(70)(5)
Benefits paid(29)(41)
Other— 1 
Projected benefit obligation, December 31$282 $362 
Change in plan assets:  
Fair value of plan assets, January 1$397 $357 
Actual return on plan assets(36)78 
Employer contribution— 3 
Benefits paid(29)(41)
Fair value of plan assets, December 31$332 $397 
Funded status, December 31$50 $35 
Accumulated benefit obligation$264 $338 
Reconciliation Of The Funded Status For Qualified Plan And SERP A reconciliation follows of the funded status for our qualified plan and SERP at the end of the measurement period to the amounts recognized in the consolidated balance sheets at December 31:
(Dollars in millions)At December 31,
20222021
Pension amounts recognized in the consolidated balance sheets:
Other assets$50 $35 
Total$50 $35 
Pension amounts recognized in accumulated other comprehensive income:  
Net actuarial gain$36 $27 
Total$36 $27 
Components Of Net Periodic Benefit Cost As Well As Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Income For Qualified Plan And SERP Below are the components of our net periodic benefit cost, as well as other changes in plan assets and benefit obligations recognized in other comprehensive income for our qualified plan and SERP at December 31:
(Dollars in millions)Years ended December 31,
202220212020
Net periodic benefit cost:
Service cost$9 $10 $9 
Non-service costs (benefit):
Interest cost10 10 12 
Expected return on plan assets(22)(21)(21)
Amortization of actuarial loss and prior service cost— 6 3 
Other(3)1 3 
Net periodic benefit cost$(6)$6 $6 
Other changes in plan assets and benefit obligations recognized in other
   comprehensive income:
Current year actuarial (gain) loss $(12)$(62)$38 
Amortization of actuarial gain (loss)3 (7)(6)
Current year prior service cost— 1 — 
Total recognized in other comprehensive (income) loss$(9)$(68)$32 
Total recognized in net periodic benefit cost and other comprehensive
   (income) loss		$(15)$(62)$38 
Fair Value Hierarchy Of Assets Measured At Fair Value On A Recurring Basis
(Dollars in millions)Level 1Level 2Level 3Total
At December 31, 2022
Fixed maturities, available for sale:    
United States government$31 $— $— $31 
Corporate — 7 — 7 
States, municipalities and political subdivisions— 6 — 6 
Total fixed maturities, available for sale31 13 — 44 
Common equities245 — — 245 
Total$276 $13 $— $289 
At December 31, 2021    
Fixed maturities, available for sale:    
United States government$31 $— $— $31 
Corporate — 11 — 11 
States, municipalities and political subdivisions— 7 — 7 
Total fixed maturities, available for sale31 18 — 49 
Common equities332 — — 332 
Total$363 $18 $— $381 
Expected Future Benefit Payments For Qualified Plan And SERP We expect to make the following benefit payments for our qualified plan and SERP, reflecting expected future service:
(Dollars in millions)Years ended December 31,
202320242025202620272028 - 2032
Expected future benefit payments$57 $20 $23 $28 $27 $140