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EMPLOYEE BENEFIT PLANS (Tables) - Qualified Defined Benefit [Member] | 12 Months Ended
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Dec. 31, 2019
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.
| 2019 |  | 2018
Discount rates | 3.33% to 3.47% |  | 4.37% to 4.46%
Rate of compensation increases | 2.11% to 5.44% |  |  | 2.11% to 3.50% |
Weighted average assumptions used to determine net periodic benefit cost: The rates below vary by plan and related work group.
| 2019 |  | 2018 |  | 2017
Discount rates | 4.37% to 4.46% |  | 3.69% to 3.78% |  |  | 4.29% to 4.50% |
Expected return on plan assets | 4.25% to 5.50% |  | 4.25% to 5.50% |  |  | 5.50% to 6.00% |
Rate of compensation increases(a) | 2.11% to 3.50% |  |  | 2.11% to 16.51% |  |  | 2.12% to 2.59% |
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 |  | 2019 |  | 2018 |  | Target |  | 2019 |  | 2018
Asset category: |  |  |  |  |  |  |  |  |  |  |
Domestic equity securities | 2% - 12% |  |  | 7 | % |  | 6 | % |  | 36% - 46% |  |  | 41 | % |  | 28 | %
Non-U.S. equity securities | 0% - 5% |  |  | 3 | % |  | 3 | % |  | 13% - 23% |  |  | 18 | % |  | 12 | %
Fixed income securities | 85% - 95% |  |  | 90 | % |  | 91 | % |  | 26% - 46% |  |  | 35 | % |  | 53 | %
Real estate | — | % |  | — | % |  | — | % |  | 0% - 10% |  |  | 6 | % |  | 7 | %
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):
| 2019 |  | 2018 |  | Fair Value Hierarchy
Fund type: |  |  |  |  |
U.S. equity market fund | $ | 773 |  |  | $ | 431 |  |  | 1 |
Non-U.S. equity fund | 344 |  |  | 183 |  |  | 1 |
Credit bond index fund | 1,009 |  |  | 1,135 |  |  | 1 |
Plan assets in common commingled trusts | $ | 2,126 |  |  | $ | 1,749 |  |  |
Real estate | 102 |  |  | 104 |  |  | (a) |
Cash equivalents | 11 |  |  | 5 |  |  | 1 |
Total plan assets | $ | 2,239 |  |  | $ | 1,858 |  |  |
(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):
| 2019 |  | 2018
Projected benefit obligation (PBO) |  |  |
Beginning of year | $ | 2,225 |  |  | $ | 2,387 |
Service cost | 42 |  |  | 48 |
Interest cost | 89 |  |  | 79 |
Actuarial (gain)/loss | 359 |  |  | (191) |
Benefits paid | (113) |  |  | (98) |
End of year | $ | 2,602 |  |  | $ | 2,225 |
Plan assets at fair value |  |  |  |  |
Beginning of year | $ | 1,858 |  |  | $ | 2,083 |
Actual return on plan assets | 429 |  |  | (127) |
Employer contributions | 65 |  |  | — |
Benefits paid | (113) |  |  | (98) |
End of year | $ | 2,239 |  |  | $ | 1,858 |
Unfunded status | $ | (363) |  |  | $ | (367) |
Percent funded | 86 | % |  | 84 | %
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] | The amounts recognized in the consolidated balance sheets (in millions):
| 2019 |  | 2018
Accrued benefit liability-long term | $ | 412 |  |  | $ | 392 |
Plan assets-long term (within Other noncurrent assets) | (49) |  |  | (25) |
Total liability recognized | $ | 363 |  |  | $ | 367 |
The amounts not yet reflected in net periodic benefit cost and included in AOCL (in millions):
| 2019 |  | 2018
Prior service credit | $ | (6) |  |  | $ | (8) |
Net loss | 595 |  |  | 607 |
Amount recognized in AOCL (pretax) | $ | 589 |  |  | $ | 599 |
Schedule of Net Benefit Costs [Table Text Block] | Net pension expense for the qualified defined-benefit plans included the following components (in millions):
| 2019 |  | 2018 |  | 2017
Service cost | $ | 42 |  |  | $ | 48 |  |  | $ | 39 |
Interest cost | 89 |  |  | 79 |  |  | 74 |
Expected return on assets | (95) |  |  | (107) |  |  | (106) |
Amortization of prior service credit | (1) |  |  | (1) |  |  | (1) |
Recognized actuarial loss | 37 |  |  | 33 |  |  | 26 |
Net pension expense | $ | 72 |  |  | $ | 52 |  |  | $ | 32 |
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 |
2020 | $ | 115 |
2021 | 118 |
2022 | 134 |
2023 | 137 |
2024 | 137 |
2025– 2029 | 800 |

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