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Employee Benefits (Tables)
12 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Change In Benefit Obligations, Change In Plan Assets, Funded Status, Amounts Recognized on Balance Sheet, and Amounts Recognized In Accumulated Other Comprehensive Income (Pretax) The following tables summarize benefit costs, as well as the benefit obligations, plan assets, funded status and rate assumptions associated with pension and postretirement health care and life insurance benefit plans.
Obligations and Funded Status
(dollars in millions)
PensionHealth Care and Life
At December 31,2023202220232022
Change in Benefit Obligations
Beginning of year$15,369 $20,167 $11,107 $14,710 
Service cost208 246 54 94 
Interest cost752 544 545 332 
Plan amendments 427 (26)
Actuarial (gain) loss, net5 (3,865)757 (3,297)
Benefits paid(1,008)(782)(982)(736)
Curtailment and termination benefits5  — 
Settlements paid(198)(1,370) — 
End of year15,133 15,369 11,455 11,107 
Change in Plan Assets
Beginning of year13,739 20,087 450 581 
Actual return on plan assets751 (4,249)62 (87)
Company contributions252 53 936 692 
Benefits paid(1,008)(782)(982)(736)
Settlements paid(198)(1,370) — 
End of year13,536 13,739 466 450 
Funded Status - End of year$(1,597)$(1,630)$(10,989)$(10,657)

(dollars in millions)
PensionHealth Care and Life
At December 31,2023202220232022
Amounts recognized in the balance sheets
Non-current assets$ $$ $— 
Current liabilities(42)(48)(685)(718)
Non-current liabilities(1,555)(1,586)(10,304)(9,939)
Total$(1,597)$(1,630)$(10,989)$(10,657)
Amounts recognized in Accumulated other comprehensive loss (pre-tax)
Prior service cost (benefit)$635 $747 $(962)$(1,355)
Total$635 $747 $(962)$(1,355)
Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets
Information for pension plans with an accumulated benefit obligation in excess of plan assets follows:
(dollars in millions)
At December 31,20232022
Accumulated benefit obligation$15,086 $15,286 
Fair value of plan assets13,534 13,694 
Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets
Information for pension plans with a projected benefit obligation in excess of plan assets follows:
(dollars in millions)
At December 31,20232022
Projected benefit obligation$15,133 $15,328 
Fair value of plan assets13,536 13,694 
Benefit or (Income) Cost Related to Pension and Postretirement Health Care and Life Insurance
The following table summarizes the components of net periodic benefit cost (income) related to our pension and postretirement health care and life insurance plans:
(dollars in millions)
PensionHealth Care and Life
Years Ended December 31,202320222021202320222021
Service cost - Cost of services$182 $216 $247 $46 $79 $94 
Service cost - Selling, general and administrative expense26 30 35 8 15 18 
Service cost208 246 282 54 94 112 
Amortization of prior service cost (credit)112 82 61 (419)(530)(894)
Expected return on plan assets(1,013)(1,119)(1,234)(31)(27)(22)
Interest cost752 544 394 545 332 289 
Remeasurement loss (gain), net266 1,505 (1,419)726 (3,182)(960)
Curtailment and termination benefits —  — — 
Other components117 1,014 (2,198)821 (3,407)(1,587)
Total$325 $1,260 $(1,916)$875 $(3,313)$(1,475)
Other Pretax Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss
Other pre-tax changes in plan assets and benefit obligations recognized in Other comprehensive (income) loss are as follows:
(dollars in millions)
PensionHealth Care and Life
At December 31,202320222021202320222021
Reversal of amortization items
Prior service cost (benefit)$(112)$(82)$(61)$419 $530 $894 
Total recognized in Other comprehensive loss (income) (pre-tax)$(112)$(82)$(61)$419 $530 $894 
Weighted Average Assumptions Used in Determining Benefit Obligations and Net Periodic Cost
The weighted-average assumptions used in determining benefit obligations follow:
PensionHealth Care and Life
At December 31,2023202220232022
Discount Rate5.00 %5.20 %5.00 %5.20 %
Rate of compensation increases3.00 %3.00 %N/AN/A
N/A - not applicable

The weighted-average assumptions used in determining net periodic cost follow:
PensionHealth Care and Life
At December 31,202320222021202320222021
Discount rate in effect for determining service cost
5.30 %3.80 %3.20 %5.30 %3.20 %3.00 %
Discount rate in effect for determining interest cost
5.10 3.20 1.90 5.10 2.30 1.80 
Expected return on plan assets7.70 6.70 6.50 7.30 4.90 4.20 
Rate of compensation increases3.00 3.00 3.00 N/AN/AN/A
N/A - not applicable
Health Care Cost Trend Rates
The assumed health care cost trend rates are as follows:
Health Care and Life
At December 31,202320222021
Weighted-average healthcare cost trend rate assumed for next year7.30 %6.60 %6.20 %
Rate to which cost trend rate gradually declines4.50 4.50 4.50 
Year the rate reaches the level it is assumed to remain thereafter203220312029
Fair Values for Plans by Asset Category
The fair values for the pension plans by asset category at December 31, 2023 are as follows:
(dollars in millions)
Asset CategoryTotalLevel 1Level 2Level 3
Cash and cash equivalents$1,956 $1,771 $185 $ 
Equity securities69 55 14  
Fixed income securities
U.S. Treasuries and agencies1,412 1,274 138  
Corporate bonds2,994 204 2,790  
International bonds341 3 338  
Other768 234 534  
Real estate996   996 
Other
Private equity512   512 
Hedge funds56  30 26 
Total investments at fair value9,104 3,541 4,029 1,534 
Investments measured at NAV4,432 
Total$13,536 $3,541 $4,029 $1,534 

The fair values for the pension plans by asset category at December 31, 2022 are as follows:
(dollars in millions)
Asset CategoryTotalLevel 1Level 2Level 3
Cash and cash equivalents$817 $779 $38 $— 
Equity securities332 318 14 — 
Fixed income securities
U.S. Treasuries and agencies1,541 1,312 229 — 
Corporate bonds2,413 13 2,400 — 
International bonds528 10 518 — 
Other711 707 — 
Real estate1,002 — — 1,002 
Other
Private equity569 — — 569 
Hedge funds88 — 36 52 
Total investments at fair value8,001 2,436 3,942 1,623 
Investments measured at NAV5,738 
Total$13,739 $2,436 $3,942 $1,623 
Health Care and Life Plans
The fair values for the other postretirement benefit plans by asset category at December 31, 2023 are as follows:
(dollars in millions)
Asset CategoryTotalLevel 1Level 2Level 3
Cash and cash equivalents$27 $ $27 $ 
Equity securities229 229   
Fixed income securities
U.S. Treasuries and agencies138 118 20  
Corporate bonds41 29 12  
International bonds12 10 2  
Other14  14  
Total investments at fair value461 386 75  
Investments measured at NAV5 
Total$466 $386 $75 $ 
The fair values for the other postretirement benefit plans by asset category at December 31, 2022 are as follows:
(dollars in millions)
Asset CategoryTotalLevel 1Level 2Level 3
Cash and cash equivalents$30 $$29 $— 
Equity securities252 252 — — 
Fixed income securities
U.S. Treasuries and agencies101 82 19 — 
Corporate bonds35 25 10 — 
International bonds12 — 
Other11 — 11 — 
Total investments at fair value441 369 72 — 
Investments measured at NAV
Total$450 $369 $72 $— 
Reconciliation of Beginning and Ending Balance of Plan Assets Measured at Fair Value
The following is a reconciliation of the beginning and ending balance of pension plan assets that are measured at fair value using significant unobservable inputs:
(dollars in millions)
Real
Estate
Private
Equity
Hedge
Funds
Total
Balance at January 1, 2022$972 $569 $110 $1,651 
Actual gain on plan assets19 30 19 68 
Purchases (sales)14 (11)
Transfers out(3)(19)(83)(105)
Balance at December 31, 20221,002 569 52 1,623 
Actual gain (loss) on plan assets(54)14 4 (36)
Purchases (sales)48 (67)(1)(20)
Transfers out (4)(29)(33)
Balance at December 31, 2023$996 $512 $26 $1,534 
Expected Benefit Payments to Retirees
The benefit payments to retirees are expected to be paid as follows:
(dollars in millions)
YearPension BenefitsHealth Care and Life
2024$1,401 $812 
20251,681 824 
20261,639 829 
2027977 836 
2028974 843 
2029 to 20334,734 4,294 
Schedule of Recorded Severance Liability
The following table provides an analysis of our severance liability:
(dollars in millions)
YearBeginning of YearCharged to
Expense
PaymentsOtherEnd of Year
2021$602 $233 $(258)$(29)$548 
2022548 319 (214)— 653 
2023653 531 (617) 567