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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets | Defined benefit plans with projected benefit obligations and accumulated benefit obligations exceeding fair value of plan assets are as follows (in millions):
| 2023 |  | 2022
Projected benefit obligation | $ | 1,403 |  |  | $ | 1,332 |
Accumulated benefit obligation | 1,327 |  |  | 1,267 |
Fair value of plan assets | 1,158 |  |  | 1,092 |
Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets |
Qualified Defined Benefit [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Assumptions Used [Table Text Block] | Weighted average assumptions used to determine benefit obligations: The rates below vary by plan and related work group.
| 2023 |  | 2022
Discount rates | 5.14% to 5.16% |  | 5.41% to 5.42%
Rate of compensation increases | 2.01% to 2.34% |  | 2.01% to 2.35%
Weighted average assumptions used to determine net periodic benefit cost: The rates below vary by plan and related work group.
| 2023 |  | 2022 |  | 2021
Discount rates | 5.41% to 5.42% |  | 2.82% to 2.90% |  | 2.43% to 2.58%
Expected return on plan assets | 5.00% to 6.50% |  | 3.00% to 5.25% |  | 3.00% to 5.50%
Rate of compensation increases | 2.01% to 2.35% |  | 2.02% to 2.38% |  | 2.02% to 2.43%
Schedule of Allocation of Plan Assets [Table Text Block] | The target and actual asset allocation of the funds in the qualified defined-benefit plans, by asset category, are as follows:
| Salaried Plan(a) |  | All Other Plans
| Target |  | 2023 |  | 2022 |  | Target |  | 2023 |  | 2022
Asset category: |  |  |  |  |  |  |  |  |  |  |
Domestic equity securities | 2%-12% |  | 7 | % |  | 7 | % |  | 29%-39% |  | 36 | % |  | 35 | %
Non-U.S. equity securities | 0%-8% |  | 3 | % |  | 3 | % |  | 9%-19% |  | 15 | % |  | 15 | %
Fixed income securities | 85%-95% |  | 90 | % |  | 90 | % |  | 37%-57% |  | 45 | % |  | 45 | %
Real estate | 0% |  | — | % |  | — | % |  | 0%-10% |  | 4 | % |  | 5 | %
Plan assets |  |  | 100 | % |  | 100 | % |  |  |  | 100 | % |  | 100 | %
(a) As our Salaried Plan is frozen and fully funded, our investment strategies differ significantly from that of our other outstanding plans. Investments are in lower-risk securities, with earnings designed to maintain a fully-funded status. Plan assets by fund category (in millions):
| 2023 |  | 2022 |  | Fair Value Hierarchy
Fund type: |  |  |  |  |
U.S. equity market fund | $ | 634 |  |  | $ | 568 |  |  | 2
Non-U.S. equity fund | 261 |  |  | 242 |  |  | 2
Credit bond index fund | 1,061 |  |  | 1,001 |  |  | 2
Plan assets in common commingled trusts | $ | 1,956 |  |  | $ | 1,811 |  |  |
Real estate | 60 |  |  | 76 |  |  | (a)
Cash equivalents | 7 |  |  | 7 |  |  | 1
Total plan assets | $ | 2,023 |  |  | $ | 1,894 |  |  |
(a) In accordance with Subtopic 820-10, certain investments that are measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.
Schedule of Net Funded Status [Table Text Block] | The following table sets forth the status of the qualified defined-benefit pension plans (in millions):
| 2023 |  | 2022
Projected benefit obligation (PBO) |  |  |
Beginning of year | $ | 2,079 |  |  | $ | 2,758 |
Service cost | 29 |  |  | 46 |
Interest cost | 108 |  |  | 66 |
Plan amendments(a) | — |  |  | 9 |
Actuarial (gain)/loss | 83 |  |  | (628) |
Benefits paid | (116) |  |  | (172) |
End of year | $ | 2,183 |  |  | $ | 2,079 |
Plan assets at fair value |  |  |
Beginning of year | $ | 1,894 |  |  | $ | 2,695 |
Actual return on plan assets | 245 |  |  | (629) |
Benefits paid | (116) |  |  | (172) |
End of year | $ | 2,023 |  |  | $ | 1,894 |
Unfunded status | $ | (160) |  |  | $ | (185) |
Percent funded | 93 | % |  | 91 | %
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] | The amounts recognized in the consolidated balance sheets (in millions):
| 2023 |  | 2022
Accrued benefit liability-long term | $ | (245) |  |  | $ | (240) |
Plan assets-long term (within Other noncurrent assets) | 85 |  |  | 55 |
Total liability recognized | $ | (160) |  |  | $ | (185) |
The amounts not yet reflected in net periodic benefit cost and included in AOCL (in millions):
| 2023 |  | 2022
Prior service cost (credit) | $ | 6 |  |  | $ | 6 |
Net loss | 367 |  |  | 438 |
Amount recognized in AOCL (pretax) | $ | 373 |  |  | $ | 444 |
Schedule of Net Benefit Costs [Table Text Block] | Net pension expense for the qualified defined-benefit plans included the following components (in millions):
| 2023 |  | 2022 |  | 2021
Service cost | $ | 29 |  |  | $ | 45 |  |  | $ | 52 |
Interest cost | 108 |  |  | 65 |  |  | 56 |
Expected return on assets | (114) |  |  | (128) |  |  | (122) |
Amortization of prior service credit | — |  |  | (1) |  |  | (1) |
Recognized actuarial loss | 23 |  |  | 8 |  |  | 37 |
Net pension expense (benefit) | $ | 46 |  |  | $ | (11) |  |  | $ | 22 |
Schedule of Expected Benefit Payments [Table Text Block] | Future benefits expected to be paid over the next ten years under the qualified defined-benefit pension plans from the assets of those plans (in millions):
| Total
2024 | $ | 113 |
2025 | 131 |
2026 | 139 |
2027 | 154 |
2028 | 163 |
2029-2033 | 854 |

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