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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2025
Retirement Benefits [Abstract] |
Schedule of Net Pension Cost and Amount Recognized in OCI for All Funded and Unfunded Plans | The components of net pension cost and the amount recognized in OCI for all funded and unfunded pension plans and postretirement benefit plan are as follows:
Year ended December 31, Dollars in millions | Pension Plans |  | Postretirement Benefit Plan
2025 | 2024 | 2023 |  | 2025 | 2024 | 2023
Interest cost on PBO | $ | 43 |  | $ | 41 |  | $ | 45 |  |  | $ | 2 |  | $ | 2 |  | $ | 2 |
Expected return on plan assets | (44) |  | (39) |  | (42) |  |  | (2) |  | (2) |  | (2) |
Amortization of losses (gains) | 8 |  | 9 |  | 9 |  |  | (1) |  | (1) |  | (1) |
Amortization of prior service credit | — |  | — |  | — |  |  | (1) |  | (1) |  | (1) |
Settlement loss | — |  | — |  | 18 |  |  | — |  | — |  | — |
Net pension cost | $ | 7 |  | $ | 11 |  | $ | 30 |  |  | $ | (2) |  | $ | (2) |  | $ | (2) |
Other changes in plan assets and benefit obligations recognized in OCI: |  |  |  |  |  |  |
Net (gain) loss | $ | 6 |  | $ | 26 |  | $ | 26 |  |  | $ | 1 |  | $ | 1 |  | $ | 1 |
Amortization of (gains) | (8) |  | 6 |  | (27) |  |  | — |  | — |  | — |
Amortization of prior service credit | — |  | — |  | — |  |  | 1 |  | 1 |  | 1 |
Total recognized in comprehensive income | $ | (2) |  | $ | 32 |  | $ | (1) |  |  | $ | 2 |  | $ | 2 |  | $ | 2 |
Total recognized in net pension cost and comprehensive income | $ | 5 |  | $ | 43 |  | $ | 29 |  |  | $ | — |  | $ | — |  | $ | — |
Schedule of Changes in Projected Benefit Obligations | The following table summarizes changes in the PBO and changes in the FVA related to our pension plans and post retirement benefit plan. Actuarial losses in 2025 associated with the postretirement benefit plan are a result of asset performance. Actuarial gains in 2024 associated with the pension plans were primarily driven by an increase in discount rates.
Year ended December 31, Dollars in millions | Pension Plans |  | Postretirement Benefit Plan
2025 | 2024 |  | 2025 | 2024
PBO at beginning of year | $ | 846 |  | $ | 923 |  |  | $ | 41 |  | $ | 40 |
Interest cost | 43 |  | 41 |  |  | 2 |  | 2 |
Actuarial losses (gains) | 14 |  | (34) |  |  | 7 |  | 6 |
Plan participants’ contributions | — |  | — |  |  | 2 |  | 1 |
Benefit payments | (81) |  | (84) |  |  | (8) |  | (8) |
PBO at end of year | $ | 822 |  | $ | 846 |  |  | $ | 44 |  | $ | 41 |
FVA at beginning of year | $ | 805 |  | $ | 827 |  |  | $ | 41 |  | $ | 40 |
Actual return on plan assets | 53 |  | $ | 49 |  |  | 9 |  | $ | 8 |
Employer contributions | 13 |  | $ | 13 |  |  | — |  | $ | — |
Plan participants’ contributions | — |  | $ | — |  |  | 2 |  | $ | 1 |
Benefit payments | (81) |  | $ | (84) |  |  | (8) |  | $ | (8) |
FVA at end of year | $ | 790 |  | $ | 805 |  |  | $ | 44 |  | $ | 41 |
Schedule of Changes in Fair Value of Plan Assets | The following table summarizes changes in the PBO and changes in the FVA related to our pension plans and post retirement benefit plan. Actuarial losses in 2025 associated with the postretirement benefit plan are a result of asset performance. Actuarial gains in 2024 associated with the pension plans were primarily driven by an increase in discount rates.
Year ended December 31, Dollars in millions | Pension Plans |  | Postretirement Benefit Plan
2025 | 2024 |  | 2025 | 2024
PBO at beginning of year | $ | 846 |  | $ | 923 |  |  | $ | 41 |  | $ | 40 |
Interest cost | 43 |  | 41 |  |  | 2 |  | 2 |
Actuarial losses (gains) | 14 |  | (34) |  |  | 7 |  | 6 |
Plan participants’ contributions | — |  | — |  |  | 2 |  | 1 |
Benefit payments | (81) |  | (84) |  |  | (8) |  | (8) |
PBO at end of year | $ | 822 |  | $ | 846 |  |  | $ | 44 |  | $ | 41 |
FVA at beginning of year | $ | 805 |  | $ | 827 |  |  | $ | 41 |  | $ | 40 |
Actual return on plan assets | 53 |  | $ | 49 |  |  | 9 |  | $ | 8 |
Employer contributions | 13 |  | $ | 13 |  |  | — |  | $ | — |
Plan participants’ contributions | — |  | $ | — |  |  | 2 |  | $ | 1 |
Benefit payments | (81) |  | $ | (84) |  |  | (8) |  | $ | (8) |
FVA at end of year | $ | 790 |  | $ | 805 |  |  | $ | 44 |  | $ | 41 |
Schedule of Amounts Recognized in Balance Sheet | The following table summarizes the funded status of the pension plans, which equals the amounts recognized in the balance sheets at December 31, 2025, and December 31, 2024, as well as the amount of pre-tax AOCI not yet recognized as net pension cost for the pension plans and postretirement benefit plan. The postretirement benefit plan’s PBO equaled its FVA at both December 31, 2025, and December 31, 2024. Ther efore, no asset or liability was recognized on our Consolidated Balance Sheets with respect to that plan.
December 31, Dollars in millions | Pension Plans |  | Postretirement Benefit Plan
2025 | 2024 |  | 2025 | 2024
Funded status (a) | $ | (32) |  | $ | (40) |  |  |  |
Net prepaid pension cost recognized consists of: |  |  |  |  |
Noncurrent assets | $ | 85 |  | $ | 80 |  |  |  |
Current liabilities | (13) |  | (13) |  |  |  |
Noncurrent liabilities | (104) |  | (107) |  |  |  |
Net prepaid pension cost recognized (b) | $ | (32) |  | $ | (40) |  |  |  |
Net unrecognized losses (gains) | $ | 329 |  | $ | 415 |  |  | $ | (8) |  | $ | (8) |
Net unrecognized prior service credit | — |  | — |  |  | (8) |  | (9) |
Total unrecognized AOCI | $ | 329 |  | $ | 415 |  |  | $ | (16) |  | $ | (17) |
(a)The shortage of the FVA under the PBO. (b)Represents the accrued benefit liability of the pension plans.
Schedule of Funded and Unfunded Pension Plans and Postretirement Benefit Plan | At December 31, 2025, we expect to pay the benefits from all funded and unfunded pension plans and postretirement benefit plan as follows:
Dollars in millions | Pension Plans | Postretirement Benefit Plan
2026 | $ | 78 |  | $ | 4 |
2027 | 77 |  | 4 |
2028 | 76 |  | 4 |
2029 | 74 |  | 4 |
2030 | 72 |  | 4 |
2030-2034 | 324 |  | 16 |
Schedule of Plans ABO in Excess of Plan Assets | As indicated in the table below, collectively our pension plans had an ABO in excess of plan assets as follows:
December 31, | 2025 | 2024
Dollars in millions | Cash Balance Pension Plan | Other Defined Benefit Plans | Cash Balance Pension Plan | Other Defined Benefit Plans
PBO | $ | 705 |  | $ | 117 |  | $ | 725 |  | $ | 121 |
ABO | 705 |  | 117 |  | 725 |  | 121 |
Fair value of plan assets | 790 |  | — |  | 805 |  | — |
Schedule of Weighted-Average Rates to Determine Actuarial Present Value of Benefit Obligations | To determine the actuarial present value of benefit obligations, we assumed the following weighted-average rates.
December 31, | 2025 | 2024
Pension Plans: |  |
Discount rate | 5.05 | % | 5.33 | %
Weighted-average interest crediting rate | 4.84 | % | 4.74 | %
Postretirement Benefit Plan: |  |
Discount rate | 4.50 | % | 4.50 | %
Schedule of Weighted-Average Rates to Determine Net Pension Cost | To determine net pension cost, we assumed the following weighted-average rates.
Year ended December 31, | 2025 | 2024 | 2023
Pension Plans: |  |  |
Discount rate | 5.33 | % | 4.68 | % | 4.85 | %
Expected return on plan assets | 5.25 | % | 4.50 | % | 4.50 | %
Postretirement Benefit Plan: |  |  |
Discount rate | 4.50 | % | 4.50 | % | 4.50 | %
Expected return on plan assets | 4.50 | % | 4.50 | % | 4.50 | %
Schedule of Asset Target Allocations Prescribed by Pension Funds' Investment Policies | The following table shows the asset target allocations prescribed by the pension fund’s investment policies based on the plan’s funded status at December 31, 2025.
Asset Class | 2025
Global equity | 16 | %
Fixed income | 84 |
Total | 100 | %
Schedule of Allocation of Plan Assets | The following tables show the fair values of our pension plan assets by asset class at December 31, 2025, and December 31, 2024.
December 31, 2025 |  |  |  |
Dollars in millions | Level 1 | Level 2 | Level 3 | Total
ASSET CLASS |  |  |  |
Mutual funds: |  |  |  |
Fixed income — U.S. | $ | — |  | $ | 321 |  | $ | — |  | $ | 321 |
Collective investment funds (measured at NAV) (a) | — |  | — |  | — |  | 446 |
Insurance investment contracts and pooled separate accounts (measured at NAV) (a) | — |  | — |  | — |  | 23 |
Total net assets at fair value | $ | — |  | $ | 321 |  | $ | — |  | $ | 790 |
(a)Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented elsewhere within this footnote.
December 31, 2024 |  |  |  |
Dollars in millions | Level 1 | Level 2 | Level 3 | Total
ASSET CLASS |  |  |  |
Mutual funds: |  |  |  |
Fixed income — U.S. | $ | — |  | $ | 324 |  | $ | — |  | $ | 324 |
Collective investment funds (measured at NAV) (a) | — |  | — |  | — |  | 459 |
Insurance investment contracts and pooled separate accounts (measured at NAV) (a) | — |  | — |  | — |  | 22 |
Total net assets at fair value | $ | — |  | $ | 324 |  | $ | — |  | $ | 805 |
(a)Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented elsewhere within this footnote. The following table shows the asset target allocations prescribed by the trust’s investment policy.
| Target Allocation
Asset Class | 2025
U.S. equity securities | 64 | %
International equity securities | 16 |
Fixed income securities | 20 |
Total | 100 | %
Schedule of Fair Values of Pension Plan Assets by Asset Category | The following tables show the fair values of our postretirement plan assets by asset class at December 31, 2025, and December 31, 2024.
December 31, 2025 |  |  |  |
Dollars in millions | Level 1 | Level 2 | Level 3 | Total
ASSET CLASS |  |  |  |
Mutual funds: |  |  |  |
Equity — U.S. | $ | 30 |  | $ | — |  | $ | — |  | $ | 30 |
Equity — International | 5 |  | — |  | — |  | 5 |
Fixed income — U.S. | 8 |  | — |  | — |  | 8 |
Other assets (measured at NAV)(a) | — |  | — |  | — |  | 1 |
Total net assets at fair value | $ | 43 |  | $ | — |  | $ | — |  | $ | 44 |
(a)Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented elsewhere within this footnote.
December 31, 2024 |  |  |  |
Dollars in millions | Level 1 | Level 2 | Level 3 | Total
ASSET CLASS |  |  |  |
Mutual funds: |  |  |  |
Equity — U.S. | $ | 26 |  | $ | — |  | $ | — |  | $ | 26 |
Equity — International | 6 |  | — |  | — |  | 6 |
Fixed income — U.S. | 8 |  | — |  | — |  | 8 |
Other assets (measured at NAV) | — |  | — |  | — |  | 1 |
Total net assets at fair value | $ | 40 |  | $ | — |  | $ | — |  | $ | 41 |
(a)Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the fair value of plan assets presented elsewhere within this footnote.

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