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Employee Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2023
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
 2023202220232022
Discount rate5.04 %5.34 %5.11 %5.42 %
Rate of compensation increase4.00 4.50 4.00 4.50 
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
 202320222021202320222021
Discount rate5.34 %2.97 %2.68 %5.42 %2.90 %2.52 %
Expected return on plan assets7.00 7.00 7.00 n/an/an/a
Rate of compensation increase4.50 
2.25-3.25
2.25-3.25
4.50 
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,
20232022
Change in projected benefit obligation:  
Benefit obligation, January 1$282 $362 
Service cost6 9 
Interest cost13 10 
Actuarial loss (gain) 10 (70)
Benefits paid(48)(29)
Projected benefit obligation, December 31$263 $282 
Change in plan assets:  
Fair value of plan assets, January 1$332 $397 
Actual return on plan assets33 (36)
Benefits paid(48)(29)
Fair value of plan assets, December 31$317 $332 
Funded status, December 31$54 $50 
Accumulated benefit obligation$247 $264 
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,
20232022
Pension amounts recognized in the consolidated balance sheets:
Other assets$54 $50 
Total$54 $50 
Pension amounts recognized in accumulated other comprehensive income:  
Net actuarial gain$(31)$(36)
Prior service cost1 — 
Total$(30)$(36)
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,
202320222021
Net periodic benefit cost:
Service cost$6 $9 $10 
Non-service costs (benefit):
Interest cost13 10 10 
Expected return on plan assets(21)(22)(21)
Amortization of actuarial (gain) loss and prior service cost(2)— 6 
Other(6)(3)1 
Net periodic benefit cost$(10)$(6)$6 
Other changes in plan assets and benefit obligations recognized in other
   comprehensive income:
Current year actuarial gain $(2)$(12)$(62)
Amortization and recognition of actuarial gain (loss)8 3 (7)
Current year prior service cost— — 1 
Total recognized in other comprehensive (income) loss$6 $(9)$(68)
Total recognized in net periodic benefit cost and other comprehensive
   income		$(4)$(15)$(62)
Fair Value Hierarchy Of Assets Measured At Fair Value On A Recurring Basis
(Dollars in millions)Level 1Level 2Level 3Total
At December 31, 2023
Fixed maturities, available for sale:    
United States government$22 $— $— $22 
Corporate — 4 — 4 
States, municipalities and political subdivisions— 6 — 6 
Total fixed maturities, available for sale22 10 — 32 
Common equities269 — — 269 
Total$291 $10 $— $301 
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 
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,
202420252026202720282029 - 2033
Expected future benefit payments$37 $27 $30 $30 $31 $128