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Pension and Other Postretirement Plans - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
plan
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Number of defined benefit pension plans | plan   2    
Profit sharing and payroll tax expense   $ 133,000,000 $ 0 $ 0
Minimum        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Percentage of pre-tax earnings paid for profit sharing plan   5.00%    
Maximum        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Percentage of pre-tax earnings paid for profit sharing plan   20.00%    
IAM National Pension Plan        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Multi-employer plan contributions     507,000,000  
United Airlines, Inc.        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Expense for defined contribution plans   $ 756,000,000 651,000,000 687,000,000
United Airlines, Inc. | Minimum        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Employer contribution percentage   1.00%    
United Airlines, Inc. | Maximum        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Employer contribution percentage   16.00%    
Other Postretirement Benefits        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Special termination benefits   $ 0 (31,000,000) (201,000,000)
Expected employer contributions to pension and postretirement plans   113,000,000    
Pension Benefits        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Special termination benefits   $ 0 0 (54,000,000)
Settlement losses       $ (430,000,000)
Employee Separation | Voluntary Separation Leave Programs        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Special termination benefits     31,000,000  
Employee Separation | Voluntary Separation Leave Programs | Full-Time Employees        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Restructuring programs, one-time contribution per employee $ 125,000   125,000  
Employee Separation | Voluntary Separation Leave Programs | Part-Time Employees        
Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]        
Restructuring programs, one-time contribution per employee $ 75,000   $ 75,000