Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS - Additional Information (Detail)

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EMPLOYEE BENEFIT PLANS - Additional Information (Detail)
$ in Millions
 6 Months Ended
Apr. 30, 2021
USD ($)
Dec. 31, 2007
USD ($)
Jun. 30, 2022
USD ($)
employee
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]            
Curtailment gain, before tax     $ 33      
Curtailment gain, after tax     $ 24      
Defined benefit plan, net actuarial gain (loss) $ 2,100          
Pre-tax actuarial gain       $ 69    
Actuarial gain, after tax       52    
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    
Multiemployer Plans, Payment Term     40 years      
National Master Agreement And Various Supplemental Agreements            
Defined Benefit Plan Disclosure [Line Items]            
Number of employees covered | employee     327,000      
Independent Pilots Association            
Defined Benefit Plan Disclosure [Line Items]            
Number of employees covered | employee     3,200      
Teamsters Local 2727            
Defined Benefit Plan Disclosure [Line Items]            
Number of employees covered | employee     1,700      
International Association Of Machinists And Aerospace Workers            
Defined Benefit Plan Disclosure [Line Items]            
Number of employees covered | employee     3,300      
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    
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     $ 744   $ 963  
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     826   830  
Defined Benefit Pension Plan | Other current liabilities            
Defined Benefit Plan Disclosure [Line Items]            
Multiemployer Plans, Withdrawal Obligation, Present Value     8   $ 8  
Defined Benefit Pension Plan | U.S. Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Amount contributed to company- sponsored benefit plans     66      
Estimated future employer contributions to defined benefit plan, current fiscal year     1,900      
U.S. Postretirement Medical Benefits | U.S. Pension Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Amount contributed to company- sponsored benefit plans     57      
Estimated future employer contributions to defined benefit plan, current fiscal year     $ 221