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EMPLOYEE BENEFIT PLANS - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) | Dec. 31, 2007 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) employee | Dec. 31, 2020 USD ($) employee
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, net actuarial gain (loss) | $ 2,100 |  |  |  |
Actuarial gain (loss) | 3,700 |  |  |  |
Basis point increase |  |  |  | 0.49% |
Benefit related to workforce reductions | 100 |  |  |  |
Asset loss resulting from actual asset returns | $ 1,700 |  |  |  |
Basis points below our expected return | 4.30% |  |  |  |
Actuarial gain recorded in accumulated other comprehensive income | $ 2,100 |  |  |  |
Pre-tax actuarial gain |  |  | $ 69 |  |
Actuarial gain, after tax |  |  | 52 |  |
Multiemployer Plans, Payment Term |  |  |  | 41 years |
Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Amendments, Reclassification Adjustment from AOCI, before Tax |  |  | 66 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Amendments, Reclassification Adjustment from AOCI, After Tax |  |  | $ 50 |  |
National Master Agreement And Various Supplemental Agreements |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of employees covered | employee |  |  |  | 316,000 |
Independent Pilots Association |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of employees covered | employee |  |  |  |  | 3,000
Teamsters Local 2727 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of employees covered | employee |  |  |  |  | 1,600
International Association Of Machinists And Aerospace Workers |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of employees covered | employee |  |  |  |  | 3,400
UPS/IBT Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Actuarial gain (loss) |  |  |  | $ 6,400 |
Reduction of the liability for coordinating benefits |  |  |  | 5,100 |
Gain from other updated actuarial assumptions |  |  |  | 1,300 |
Benefit from basis point increase in discount rate |  |  |  | $ 1,600 |
Basis point increase |  |  |  | 0.72% |
Asset loss resulting from actual asset returns |  |  |  | $ 300 |
Basis points below expected return |  |  |  | 2.20% |
Actuarial gain recorded in accumulated other comprehensive income |  |  |  | $ 3,100 |
Pre-tax actuarial gain |  |  |  | 3,300 |
Actuarial gain, after tax |  |  |  | 2,500 |
Defined Benefit Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure |  |  |  | 966 | $ 1,000
Defined Benefit Pension Plan | Central States Pension Fund |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Payment of withdrawal liability |  | $ 6,100 |  |  |
Pension liability |  |  |  |  | 5,500
Defined Benefit Pension Plan | Long term debt |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value |  |  |  | 832 | 837
Defined Benefit Pension Plan | Other current liabilities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value |  |  |  | 8 | $ 7
Defined Benefit Pension Plan | U.S. Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Amount contributed to company- sponsored benefit plans |  |  |  | 96 |
U.S. Postretirement Medical Benefits | U.S. Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Amount contributed to company- sponsored benefit plans |  |  |  | 235 |
Estimated future employer contributions to defined benefit plan, current fiscal year |  |  |  | $ 21,000 |

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