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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2020
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 accumulated benefit obligations exceeding fair value of plan assets are as follows (in millions):
 20202019
Projected benefit obligation$2,207 $1,957 
Accumulated benefit obligation2,057 1,539 
Fair value of plan assets1,710 1,545 
Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets
Defined benefit plans with projected benefit obligations exceeding fair value of plan assets are as follows (in millions):
 20202019
Projected benefit obligation$2,207 $1,957 
Fair value of plan assets1,710 1,545 
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.
 20202019
Discount rates2.43% to 2.58%3.33% to 3.47%
Rate of compensation increases2.02% to 2.43%2.11% to 5.44%
Weighted average assumptions used to determine net periodic benefit cost:

The rates below vary by plan and related work group.
 202020192018
Discount rates3.33% to 3.47%4.37% to 4.46%3.69% to 3.78%
Expected return on plan assets3.25% to 5.50%4.25% to 5.50%4.25% to 5.50%
Rate of compensation increases2.11% to 5.44%2.11% to 3.50%2.11% to 16.51%
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
 Target20202019Target20202019
Asset category:  
Domestic equity securities2% - 12%7 %7 %36% - 46%44 %41 %
Non-U.S. equity securities0% - 8%3 %3 %13% - 23%18 %18 %
Fixed income securities85% - 95%90 %90 %31% - 41%33 %35 %
Real estate— %— %— %0% - 10%5 %6 %
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):
 20202019Fair Value Hierarchy
Fund type:  
U.S. equity market fund$914 $773 1
Non-U.S. equity fund384 344 1
Credit bond index fund1,088 1,009 1
Plan assets in common commingled trusts$2,386 $2,126 
Real estate96 102 (a)
Cash equivalents6 11 1
Total plan assets$2,488 $2,239 
(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):
 20202019
Projected benefit obligation (PBO)  
Beginning of year$2,602 $2,225 
Service cost52 42 
Interest cost75 89 
Actuarial (gain)/loss339 359 
Benefits paid(134)(113)
End of year$2,934 $2,602 
Plan assets at fair value  
Beginning of year$2,239 $1,858 
Actual return on plan assets383 429 
Employer contributions— 65 
Benefits paid(134)(113)
End of year$2,488 $2,239 
Unfunded status$(446)$(363)
Percent funded85 %86 %
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
The amounts recognized in the consolidated balance sheets (in millions): 
 20202019
Accrued benefit liability-long term$502 $412 
Plan assets-long term (within Other noncurrent assets)(51)(49)
Total liability recognized$451 $363 
 
The amounts not yet reflected in net periodic benefit cost and included in AOCL (in millions):
 20202019
Prior service credit$(5)$(6)
Net loss626 595 
Amount recognized in AOCL (pretax)$621 $589 
Schedule of Net Benefit Costs [Table Text Block]
Net pension expense for the qualified defined-benefit plans included the following components (in millions): 
 202020192018
Service cost$46 $42 $48 
Interest cost75 89 79 
Restructuring charges(a)
11 — — 
Expected return on assets(110)(95)(107)
Amortization of prior service credit(1)(1)(1)
Recognized actuarial loss35 37 33 
Net pension expense$56 $72 $52 
(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
2021$123 
2022142 
2023143 
2024141 
2025157 
2026– 2030829