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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2021
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):
 20212020
Projected benefit obligation$1,750 $2,207 
Accumulated benefit obligation1,685 2,057 
Fair value of plan assets1,595 1,710 
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.
 20212020
Discount rates
2.82% to 2.90%
2.43% to 2.58%
Rate of compensation increases
2.02% to 2.38%
2.02% to 2.43%

Weighted average assumptions used to determine net periodic benefit cost:

The rates below vary by plan and related work group.
 202120202019
Discount rates
2.43% to 2.58%
3.33% to 3.47%
4.37% to 4.46%
Expected return on plan assets
3.00% to 5.50%
3.25% to 5.50%
4.25% to 5.50%
Rate of compensation increases
2.02% to 2.43%
2.11% to 5.44%
2.11% to 3.50%
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
 Target20212020Target20212020
Asset category:  
Domestic equity securities
2%-12%
7 %7 %
32%-42%
38 %44 %
Non-U.S. equity securities
—%-8%
3 %3 %
11%-21%
16 %18 %
Fixed income securities
85%-95%
90 %90 %
32%-52%
42 %33 %
Real estate
—%
— %— %
—%-5%
4 %5 %
Plan assets100 %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):
 20212020Fair Value Hierarchy
Fund type:  
U.S. equity market fund$885 $914 1
Non-U.S. equity fund370 384 1
Credit bond index fund1,342 1,088 1
Plan assets in common commingled trusts$2,597 $2,386 
Real estate92 96 (a)
Cash equivalents6 6 1
Total plan assets$2,695 $2,488 
(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):
 20212020
Projected benefit obligation (PBO)  
Beginning of year$2,934 $2,602 
Service cost56 52 
Interest cost56 75 
Actuarial (gain)/loss(171)339 
Benefits paid(117)(134)
End of year$2,758 $2,934 
Plan assets at fair value  
Beginning of year$2,488 $2,239 
Actual return on plan assets224 383 
Employer contributions100 — 
Benefits paid(117)(134)
End of year$2,695 $2,488 
Unfunded status$(63)$(446)
Percent funded98 %85 %
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
The amounts recognized in the consolidated balance sheets (in millions): 
 20212020
Accrued benefit liability-long term$(155)$(502)
Plan assets-long term (within Other noncurrent assets)92 51 
Total liability recognized$(63)$(451)
 
The amounts not yet reflected in net periodic benefit cost and included in AOCL (in millions):
 20212020
Prior service credit$(4)$(5)
Net loss316 626 
Amount recognized in AOCL (pretax)$312 $621 
Schedule of Net Benefit Costs [Table Text Block]
Net pension expense for the qualified defined-benefit plans included the following components (in millions): 
 202120202019
Service cost$52 $46 $42 
Interest cost56 75 89 
Restructuring charges(a)
— 11 — 
Expected return on assets(122)(110)(95)
Amortization of prior service credit(1)(1)(1)
Recognized actuarial loss37 35 37 
Net pension expense$22 $56 $72 
(a)In conjunction with the workforce reductions stemming from the COVID-19 pandemic, the Company recorded additional expense for employees accepting incentive leaves of absence. Such expense is included in Special items - restructuring charges on the consolidated statement of operations for the year-ended December 31, 2020.
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
2022$119 
2023128 
2024133 
2025149 
2026151 
2027– 2031830