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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2022
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 31,2022202120222021
Change in Benefit Obligations
Beginning of year$20,167 $22,236 $14,710 $16,168 
Service cost246 282 94 112 
Interest cost544 394 332 289 
Plan amendments427 — 4 — 
Actuarial gain, net(3,865)(605)(3,297)(930)
Benefits paid(782)(816)(736)(929)
Curtailment and termination benefits2 6 — — 
Settlements paid(1,370)(1,330)— — 
End of year15,369 20,167 11,107 14,710 
Change in Plan Assets
Beginning of year20,087 20,128 581 572 
Actual return on plan assets(4,249)2,049 (87)53 
Company contributions53 56 692 885 
Benefits paid(782)(816)(736)(929)
Settlements paid(1,370)(1,330)— — 
End of year13,739 20,087 450 581 
Funded Status - End of year$(1,630)$(80)$(10,657)$(14,129)

(dollars in millions)
PensionHealth Care and Life
At December 31,2022202120222021
Amounts recognized in the balance sheets
Non-current assets$4 $376 $— $— 
Current liabilities(48)(55)(718)(748)
Non-current liabilities(1,586)(401)(9,939)(13,381)
Total$(1,630)$(80)$(10,657)$(14,129)
Amounts recognized in Accumulated other comprehensive loss (pre-tax)
Prior service cost (benefit)$747 $402 $(1,355)$(1,889)
Total$747 $402 $(1,355)$(1,889)
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 31,20222021
Accumulated benefit obligation$15,286 $456 
Fair value of plan assets13,694 — 
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 31,20222021
Projected benefit obligation$15,328 $456 
Fair value of plan assets13,694 — 
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 31,202220212020202220212020
Service cost - Cost of services$216 $247 $245 $79 $94 $89 
Service cost - Selling, general and administrative expense30 35 60 15 18 21 
Service cost246 282 305 94 112 110 
Amortization of prior service cost (credit)82 61 61 (530)(894)(966)
Expected return on plan assets(1,119)(1,234)(1,186)(27)(22)(28)
Interest cost544 394 505 332 289 429 
Remeasurement loss (gain), net1,505 (1,419)744 (3,182)(960)866 
Curtailment and termination benefits2 — — — — — 
Other components1,014 (2,198)124 (3,407)(1,587)301 
Total$1,260 $(1,916)$429 $(3,313)$(1,475)$411 
Other Pretax Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss
Other pre-tax changes in plan assets and benefit obligations recognized in Other comprehensive (income) loss are as follows:
(dollars in millions)
PensionHealth Care and Life
At December 31,202220212020202220212020
Reversal of amortization items
Prior service cost (benefit)$(82)$(61)$(61)$530 $894 $966 
Total recognized in Other comprehensive loss (income) (pre-tax)$(82)$(61)$(61)$530 $894 $966 
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 31,2022202120222021
Discount Rate5.20 %3.00 %5.20 %2.90 %
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 31,202220212020202220212020
Discount rate in effect for determining service cost
3.80 %3.20 %3.30 %3.20 %3.00 %3.50 %
Discount rate in effect for determining interest cost
3.20 1.90 2.40 2.30 1.80 2.80 
Expected return on plan assets6.70 6.50 6.50 4.90 4.20 4.50 
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 31,202220212020
Weighted-average healthcare cost trend rate assumed for next year6.60 %6.20 %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 thereafter203120292029
Fair Values for Plans by Asset Category
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 4 707 — 
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 

The fair values for the pension plans by asset category at December 31, 2021 are as follows:
(dollars in millions)
Asset CategoryTotalLevel 1Level 2Level 3
Cash and cash equivalents$1,221 $1,208 $13 $— 
Equity securities2,482 2,463 19 — 
Fixed income securities
U.S. Treasuries and agencies1,785 1,652 133 — 
Corporate bonds4,046 123 3,923 — 
International bonds1,407 23 1,384 — 
Other695 — 695 — 
Real estate972 — — 972 
Other
Private equity569 — — 569 
Hedge funds224 — 114 110 
Total investments at fair value13,401 5,469 6,281 1,651 
Investments measured at NAV6,686 
Total$20,087 $5,469 $6,281 $1,651 
Health Care and Life Plans
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 $1 $29 $— 
Equity securities252 252 — — 
Fixed income securities
U.S. Treasuries and agencies101 82 19 — 
Corporate bonds35 25 10 — 
International bonds12 9 3 — 
Other11 — 11 — 
Total investments at fair value441 369 72 — 
Investments measured at NAV9 
Total$450 $369 $72 $— 
The fair values for the other postretirement benefit plans by asset category at December 31, 2021 are as follows:
(dollars in millions)
Asset CategoryTotalLevel 1Level 2Level 3
Cash and cash equivalents$36 $— $36 $— 
Equity securities284 284 — — 
Fixed income securities
U.S. Treasuries and agencies160 150 10 — 
Corporate bonds64 50 14 — 
International bonds14 10 4 — 
Other10 — 10 — 
Total investments at fair value568 494 74 — 
Investments measured at NAV13 
Total$581 $494 $74 $— 
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)
Equity
Securities		Corporate
Bonds		International
Bonds		Real
Estate		Private
Equity		Hedge
Funds		Total
Balance at January 1, 2021$2 $176 $20 $757 $414 $138 $1,507 
Actual gain (loss) on plan assets(1)(5)— (21)(19)1 (45)
Purchases (sales)(1)1 (4)197 147 81 421 
Transfers out— (172)(16)39 27 (110)(232)
Balance at December 31, 2021— — — 972 569 110 1,651 
Actual gain on plan assets— — — 19 30 19 68 
Purchases (sales)— — — 14 (11)6 9 
Transfers out— — — (3)(19)(83)(105)
Balance at December 31, 2022$— $— $— $1,002 $569 $52 $1,623 
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
2023$1,679 $867 
20241,583 863 
20251,578 854 
20261,553 845 
2027937 837 
2028 to 20324,628 4,082 
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
2020$565 $309 $(248)$(24)$602 
2021602 233 (258)(29)548 
2022548 319 (214)— 653