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STATEMENTS OF CONSOLIDATED OPERATIONS (UA) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating revenue:      
Total operating revenue $ 57,063 $ 53,717 $ 44,955
Operating expense:      
Salaries and related costs 16,678 14,787 11,466
Aircraft fuel 11,756 12,651 13,113
Landing fees and other rent 3,437 3,076 2,576
Aircraft maintenance materials and outside repairs 3,063 2,736 2,153
Depreciation and amortization 2,928 2,671 2,456
Regional capacity purchase 2,516 2,400 2,299
Distribution expenses 2,231 1,977 1,535
Aircraft rent 193 197 252
Special charges 112 949 140
Other operating expenses 9,053 8,062 6,628
Total operating expense 51,967 49,506 42,618
Operating income 5,096 4,211 2,337
Nonoperating income (expense):      
Interest expense (1,629) (1,956) (1,778)
Interest income 726 827 298
Interest capitalized 227 182 105
Unrealized gains (losses) on investments, net (199) 27 20
Miscellaneous, net (53) 96 8
Total nonoperating expense, net (928) (824) (1,347)
Income before income taxes 4,168 3,387 990
Income tax expense 1,019 769 253
Net income 3,149 2,618 737
Passenger revenue      
Operating revenue:      
Total operating revenue 51,829 49,046 40,032
Cargo      
Operating revenue:      
Total operating revenue 1,743 1,495 2,171
Other operating revenue      
Operating revenue:      
Total operating revenue 3,491 3,176 2,752
United Airlines, Inc.      
Operating revenue:      
Total operating revenue 57,063 53,717 44,955
Operating expense:      
Salaries and related costs 16,678 14,787 11,466
Aircraft fuel 11,756 12,651 13,113
Landing fees and other rent 3,437 3,076 2,576
Aircraft maintenance materials and outside repairs 3,063 2,736 2,153
Depreciation and amortization 2,928 2,671 2,456
Regional capacity purchase 2,516 2,400 2,299
Distribution expenses 2,231 1,977 1,535
Aircraft rent 193 197 252
Special charges 112 949 140
Other operating expenses 9,050 8,059 6,626
Total operating expense 51,964 49,503 42,616
Operating income 5,099 4,214 2,339
Nonoperating income (expense):      
Interest expense (1,629) (1,956) (1,778)
Interest income 726 827 298
Interest capitalized 227 182 105
Unrealized gains (losses) on investments, net (199) 27 20
Miscellaneous, net (53) 96 8
Total nonoperating expense, net (928) (824) (1,347)
Income before income taxes 4,171 3,390 992
Income tax expense 1,020 770 253
Net income 3,151 2,620 739
United Airlines, Inc. | Passenger revenue      
Operating revenue:      
Total operating revenue 51,829 49,046 40,032
United Airlines, Inc. | Cargo      
Operating revenue:      
Total operating revenue 1,743 1,495 2,171
United Airlines, Inc. | Other operating revenue      
Operating revenue:      
Total operating revenue $ 3,491 $ 3,176 $ 2,752