Statements of Consolidated Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating revenue:
Operating revenue	$ 5,471	$ 1,475	$ 8,692	$ 9,454
Operating expense:
Salaries and related costs	2,276	2,170	4,500	5,125
Aircraft fuel	1,232	240	2,083	1,966
Depreciation and amortization	620	618	1,243	1,233
Landing fees and other rent	564	429	1,083	1,052
Regional capacity purchase	547	388	1,026	1,125
Aircraft maintenance materials and outside repairs	302	110	571	544
Distribution expenses	139	31	224	326
Aircraft rent	52	47	107	97
Special charges (credits)	(948)	(1,449)	(2,325)	(1,386)
Other operating expenses	957	528	1,831	1,981
Total operating expense	5,741	3,112	10,343	12,063
Operating loss	(270)	(1,637)	(1,651)	(2,609)
Nonoperating income (expense):
Interest expense	(426)	(196)	(779)	(367)
Interest capitalized	22	17	39	38
Interest income	12	11	19	37
Unrealized gains (losses) on investments, net	147	9	125	(310)
Miscellaneous, net	(49)	(207)	(68)	(906)
Total nonoperating expense, net	(294)	(366)	(664)	(1,508)
Loss before income tax benefit	(564)	(2,003)	(2,315)	(4,117)
Income tax benefit	(130)	(376)	(524)	(786)
Net loss	$ (434)	$ (1,627)	$ (1,791)	$ (3,331)
Loss per share, basic (in dollars per share)	$ (1.34)	$ (5.79)	$ (5.60)	$ (12.59)
Loss per share, diluted (in dollars per share)	$ (1.34)	$ (5.79)	$ (5.60)	$ (12.59)
United Airlines, Inc.
Operating revenue:
Operating revenue	$ 5,471	$ 1,475	$ 8,692	$ 9,454
Operating expense:
Salaries and related costs	2,276	2,170	4,500	5,125
Aircraft fuel	1,232	240	2,083	1,966
Depreciation and amortization	620	618	1,243	1,233
Landing fees and other rent	564	429	1,083	1,052
Regional capacity purchase	547	388	1,026	1,125
Aircraft maintenance materials and outside repairs	302	110	571	544
Distribution expenses	139	31	224	326
Aircraft rent	52	47	107	97
Special charges (credits)	(948)	(1,449)	(2,325)	(1,386)
Other operating expenses	956	527	1,830	1,980
Total operating expense	5,740	3,111	10,342	12,062
Operating loss	(269)	(1,636)	(1,650)	(2,608)
Nonoperating income (expense):
Interest expense	(426)	(196)	(779)	(367)
Interest capitalized	22	17	39	38
Interest income	12	11	19	37
Unrealized gains (losses) on investments, net	147	9	125	(310)
Miscellaneous, net	(50)	(208)	(69)	(906)
Total nonoperating expense, net	(295)	(367)	(665)	(1,508)
Loss before income tax benefit	(564)	(2,003)	(2,315)	(4,116)
Income tax benefit	(130)	(377)	(524)	(786)
Net loss	(434)	(1,626)	(1,791)	(3,330)
Passenger revenue
Operating revenue:
Operating revenue	4,366	681	6,682	7,746
Passenger revenue | United Airlines, Inc.
Operating revenue:
Operating revenue	4,366	681	6,682	7,746
Cargo
Operating revenue:
Operating revenue	606	402	1,103	666
Cargo | United Airlines, Inc.
Operating revenue:
Operating revenue	606	402	1,103	666
Other operating revenue
Operating revenue:
Operating revenue	499	392	907	1,042
Other operating revenue | United Airlines, Inc.
Operating revenue:
Operating revenue	$ 499	$ 392	$ 907	$ 1,042