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STATEMENTS OF CONSOLIDATED OPERATIONS (UNAUDITED) (UA) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating revenue:    
Total operating revenue $ 12,539 $ 11,429
Operating expense:    
Salaries and related costs 3,932 3,322
Aircraft fuel 2,954 3,174
Landing fees and other rent 804 717
Aircraft maintenance materials and outside repairs 773 702
Depreciation and amortization 708 655
Regional capacity purchase 585 615
Distribution expenses 480 403
Aircraft rent 43 56
Special charges 13 14
Other 2,148 1,814
Total operating expense 12,440 11,472
Operating income (loss) 99 (43)
Nonoperating income (expense):    
Interest expense (454) (486)
Interest income 177 170
Interest capitalized 61 38
Unrealized gains (losses) on investments, net (37) 24
Miscellaneous, net (10) 41
Total nonoperating expense, net (263) (213)
Loss before income tax benefit (164) (256)
Income tax benefit (40) (62)
Net loss (124) (194)
Passenger    
Operating revenue:    
Total operating revenue 11,313 10,274
Cargo    
Operating revenue:    
Total operating revenue 391 398
Other    
Operating revenue:    
Total operating revenue 835 757
United Airlines, Inc.    
Operating revenue:    
Total operating revenue 12,539 11,429
Operating expense:    
Salaries and related costs 3,932 3,322
Aircraft fuel 2,954 3,174
Landing fees and other rent 804 717
Aircraft maintenance materials and outside repairs 773 702
Depreciation and amortization 708 655
Regional capacity purchase 585 615
Distribution expenses 480 403
Aircraft rent 43 56
Special charges 13 14
Other 2,148 1,814
Total operating expense 12,440 11,472
Operating income (loss) 99 (43)
Nonoperating income (expense):    
Interest expense (454) (486)
Interest income 177 170
Interest capitalized 61 38
Unrealized gains (losses) on investments, net (37) 24
Miscellaneous, net (10) 41
Total nonoperating expense, net (263) (213)
Loss before income tax benefit (164) (256)
Income tax benefit (40) (62)
Net loss (124) (194)
United Airlines, Inc. | Passenger    
Operating revenue:    
Total operating revenue 11,313 10,274
United Airlines, Inc. | Cargo    
Operating revenue:    
Total operating revenue 391 398
United Airlines, Inc. | Other    
Operating revenue:    
Total operating revenue $ 835 $ 757