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Statements of Consolidated Operations - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating revenue:      
Passenger-Mainline $ 26,552 $ 25,414 $ 26,333
Passenger-Regional 5,852 6,043 6,452
Total passenger revenue 32,404 31,457 32,785
Cargo 1,035 876 937
Other operating revenue 4,297 4,223 4,142
Total operating revenue 37,736 36,556 37,864
Operating expense:      
Salaries and related costs 11,045 10,275 9,713
Aircraft fuel 6,913 5,813 7,522
Landing fees and other rent 2,240 2,165 2,203
Regional capacity purchase 2,232 2,197 2,290
Depreciation and amortization 2,149 1,977 1,819
Aircraft maintenance materials and outside repairs 1,856 1,749 1,651
Distribution expenses 1,349 1,303 1,342
Aircraft rent 621 680 754
Special charges (Note 14) 176 638 326
Other operating expenses 5,657 5,421 5,078
Total operating expenses 34,238 32,218 32,698
Operating income 3,498 4,338 5,166
Nonoperating income (expense):      
Interest expense (643) (614) (669)
Interest capitalized 84 72 49
Interest income 57 42 25
Miscellaneous, net (Note 14) 3 (19) (352)
Total nonoperating expense, net (499) (519) (947)
Income before income taxes 2,999 3,819 4,219
Income tax expense (benefit) (Note 14) 868 1,556 (3,121)
Net income $ 2,131 $ 2,263 $ 7,340
Earnings per share, basic $ 7.04 $ 6.86 $ 19.52
Earnings per share, diluted $ 7.02 $ 6.85 $ 19.47
United Airlines, Inc.      
Operating revenue:      
Passenger-Mainline $ 26,552 $ 25,414 $ 26,333
Passenger-Regional 5,852 6,043 6,452
Total passenger revenue 32,404 31,457 32,785
Cargo 1,035 876 937
Other operating revenue 4,297 4,223 4,142
Total operating revenue 37,736 36,556 37,864
Operating expense:      
Salaries and related costs 11,045 10,275 9,713
Aircraft fuel 6,913 5,813 7,522
Landing fees and other rent 2,240 2,165 2,203
Regional capacity purchase 2,232 2,197 2,290
Depreciation and amortization 2,149 1,977 1,819
Aircraft maintenance materials and outside repairs 1,856 1,749 1,651
Distribution expenses 1,349 1,303 1,342
Aircraft rent 621 680 754
Special charges (Note 14) 176 638 326
Other operating expenses 5,655 5,418 5,076
Total operating expenses 34,236 32,215 32,696
Operating income 3,500 4,341 5,168
Nonoperating income (expense):      
Interest expense (643) (614) (670)
Interest capitalized 84 72 49
Interest income 57 42 25
Miscellaneous, net (Note 14) 3 (19) (351)
Total nonoperating expense, net (499) (519) (947)
Income before income taxes 3,001 3,822 4,221
Income tax expense (benefit) (Note 14) 852 1,558 (3,080)
Net income $ 2,149 $ 2,264 $ 7,301