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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Retirement Benefits [Abstract] |
Schedule of Changes in Projected Benefit Obligations [Table Text Block] | A December 31 measurement date is used for all of the defined benefit and postretirement plans. The status of these plans as of December 31, 2023 and 2022 is summarized below (dollars in millions):
|  | December 31,
|  | Pension Benefits |  | Other Benefits
|  | 2023 |  | 2022 |  | 2023 |  | 2022
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 214 |  |  | $ | 256 |  |  | $ | 60 |  |  | $ | 75 |
Service cost |  | 14 |  |  | 17 |  |  | 2 |  |  | 3 |
Interest cost |  | 10 |  |  | 6 |  |  | 3 |  |  | 2 |
Participant contributions |  | — |  |  | — |  |  | — |  |  | — |
Amendments |  | — |  |  | — |  |  | — |  |  | 2 |
Actuarial (gains) losses |  | 10 |  |  | (50) |  |  | — |  |  | (20) |
Benefits paid |  | (13) |  |  | (12) |  |  | (2) |  |  | (2) |
Foreign exchange translations and other adjustments |  | 1 |  |  | (3) |  |  | — |  |  | — |
Benefit obligation at end of year |  | $ | 236 |  |  | $ | 214 |  |  | $ | 63 |  |  | $ | 60 |
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] |
|  | December 31,
|  | Pension Benefits |  | Other Benefits
|  | 2023 |  | 2022 |  | 2023 |  | 2022
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 158 |  |  | $ | 179 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  | 17 |  |  | (30) |  |  | — |  |  | — |
Employer contributions |  | 18 |  |  | 21 |  |  | 2 |  |  | 2 |
Participant contributions |  | — |  |  | — |  |  | — |  |  | — |
Benefits paid |  | (13) |  |  | (12) |  |  | (2) |  |  | (2) |
Fair value of plan assets at end of year |  | $ | 180 |  |  | $ | 158 |  |  | $ | — |  |  | $ | — |
Funded status at end of year |  | $ | (56) |  |  | $ | (56) |  |  | $ | (63) |  |  | $ | (60) |
Schedule of Net Funded Status [Table Text Block] |
|  | December 31,
|  | Qualified Plans |  | Non-Qualified Plans (1) |  | Total
|  | 2023 |  | 2022 |  | 2023 |  | 2022 |  | 2023 |  | 2022
Aggregate fair value of plan assets |  | $ | 180 |  |  | $ | 158 |  |  | $ | — |  |  | $ | — |  |  | $ | 180 |  |  | $ | 158 |
Aggregate projected benefit obligations |  | 156 |  |  | 142 |  |  | 80 |  |  | 72 |  |  | 236 |  |  | 214 |
Over (under) funded |  | $ | 24 |  |  | $ | 16 |  |  | $ | (80) |  |  | $ | (72) |  |  | $ | (56) |  |  | $ | (56) |
(1)For non-qualified plans, there are no required funding levels.
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
| December 31,
| Pension Benefits |  | Other Benefits
| 2023 |  | 2022 |  | 2023 |  | 2022
Amounts recognized in accumulated other comprehensive income (loss): |  |  |  |  |  |  |
Net actuarial (gain) loss | $ | 41 |  |  | $ | 40 |  |  | $ | 1 |  |  | $ | (1) |
Net prior service cost (credit) | — |  |  | — |  |  | (5) |  |  | (6) |
Total | $ | 41 |  |  | $ | 40 |  |  | $ | (4) |  |  | $ | (7) |
Schedule Of Projected Benefit Obligations In Excess Of Fair Value Of Plan Assets [Table Text Block] | The following table presents information for pension plans with a projected benefit obligation in excess of plan assets as of December 31, 2023 and 2022 (dollars in millions):
|  | 2023 |  | 2022
Projected benefit obligation |  | $ | 81 |  |  | $ | 73 |
Fair value of plan assets |  | — |  |  | — |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] | The following table presents information for pension plans with an accumulated benefit obligation in excess of plan assets as of December 31, 2023 and 2022 (dollars in millions):
|  | 2023 |  | 2022
Accumulated benefit obligation |  | $ | 74 |  |  | $ | 66 |
Fair value of plan assets |  | — |  |  | — |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | The components of net periodic benefit cost, included in other operating expenses on the consolidated statements of income, and other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) were as follows (dollars in millions):
|  | Pension Benefits |  | Other Benefits
|  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
Net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 14 |  |  | $ | 17 |  |  | $ | 18 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 3 |
Interest cost |  | 10 |  |  | 6 |  |  | 4 |  |  | 3 |  |  | 2 |  |  | 2 |
Expected return on plan assets |  | (11) |  |  | (12) |  |  | (10) |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial losses |  | 2 |  |  | 3 |  |  | 6 |  |  | — |  |  | 1 |  |  | 2 |
Amortization of prior service cost (credit) |  | — |  |  | — |  |  | — |  |  | (2) |  |  | (2) |  |  | (1) |
Settlements |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost |  | 15 |  |  | 14 |  |  | 18 |  |  | 3 |  |  | 4 |  |  | 6 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial (gains) losses |  | 3 |  |  | (9) |  |  | (13) |  |  | 1 |  |  | (20) |  |  | (6) |
Amortization of net actuarial (losses) |  | (2) |  |  | (3) |  |  | (6) |  |  | — |  |  | (1) |  |  | (2) |
Amortization of prior service (cost) credit |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 2 |  |  | 1 |
Settlements |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Prior service cost (credit) |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | (3) |
Foreign exchange translations and other adjustments |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total recognized in other comprehensive income (loss) |  | 1 |  |  | (12) |  |  | (19) |  |  | 3 |  |  | (18) |  |  | (10) |
Total recognized in net periodic benefit cost and other comprehensive income (loss) |  | $ | 16 |  |  | $ | 2 |  |  | $ | (1) |  |  | $ | 6 |  |  | $ | (14) |  |  | $ | (4) |
Schedule of Expected Benefit Payments [Table Text Block] | The following benefit payments, which reflect expected future service as appropriate, are expected to be paid (dollars in millions):
|  | Pension Benefits |  | Other Benefits
2024 |  | $ | 15 |  |  | $ | 3 |
2025 |  | 17 |  |  | 3 |
2026 |  | 17 |  |  | 3 |
2027 |  | 19 |  |  | 4 |
2028 |  | 20 |  |  | 4 |
2029 – 2033 |  | 107 |  |  | 21 |
Defined Benefit Plan, Assumptions [Table Text Block] | The weighted average assumptions used to determine the benefit obligation and net periodic benefit cost were as follows:
|  | Pension Benefits |  | Other Benefits
|  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
Benefit obligation |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 4.78 | % |  | 5.00 | % |  | 2.64 | % |  | 4.79 | % |  | 4.99 | % |  | 2.76 | %
Rate of compensation increase |  | 4.71 | % |  | 4.96 | % |  | 4.74 | % |  | n/a |  | n/a |  | n/a
Net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 5.01 | % |  | 2.65 | % |  | 2.21 | % |  | 4.99 | % |  | 2.76 | % |  | 2.41 | %
Expected long-term rate of return on plan assets |  | 7.00 | % |  | 6.50 | % |  | 6.50 | % |  | n/a |  | n/a |  | n/a
Rate of compensation increase |  | 4.97 | % |  | 4.75 | % |  | 4.71 | % |  | n/a |  | n/a |  | n/a
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | The assumed health care cost trend rates used in measuring the accumulated non-pension postretirement benefit obligation were as follows:
|  | As of December 31,
|  | 2023 |  | 2022
Health care cost trend rates assumed for next year |  | 6.50 | % |  | 7.00 | %
Ultimate cost trend rate |  | 4.50 | % |  | 4.50 | %
Year ultimate trend is reached |  | 2028 |  | 2028
Schedule of Allocation of Plan Assets [Table Text Block] | The fair values of the Company’s qualified pension plan assets as of December 31, 2023 and 2022 are summarized below (dollars in millions):
|  | December 31, 2023
|  |  |  | Fair Value Measurement Using:
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Mutual Funds (1) |  | $ | 154 |  |  | $ | 154 |  |  | $ | — |  |  | $ | — |
Exchange Traded Funds (2) |  | 10 |  |  | 10 |  |  | — |  |  | — |
Cash |  | 16 |  |  | 16 |  |  | — |  |  | — |
Total |  | $ | 180 |  |  | $ | 180 |  |  | $ | — |  |  | $ | — |
(1)Mutual funds were invested 23% in U.S. equity funds, 36% in U.S. fixed income funds, 25% in non-U.S. equity funds and 16% in other. (2)Exchange traded funds were invested 100% in U.S. equity funds.
|  | December 31, 2022
|  |  |  | Fair Value Measurement Using:
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Mutual Funds (3) |  | $ | 158 |  |  | $ | 158 |  |  | $ | — |  |  | $ | — |
Cash |  | — |  |  | — |  |  | — |  |  | — |
Total |  | $ | 158 |  |  | $ | 158 |  |  | $ | — |  |  | $ | — |
(3)Mutual funds were invested 25% in U.S. equity funds, 40% in U.S. fixed income funds, 16% in non-U.S. equity funds and 19% in other.

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (b) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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