Statements of Consolidated Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018		Sep. 30, 2019	Sep. 30, 2018
Operating revenue:
Operating revenue	$ 11,380	$ 11,003	[1]	$ 32,371	$ 30,812	[1]
Operating expense:
Salaries and related costs	3,063	2,930	[1]	8,993	8,534	[1]
Aircraft fuel	2,296	2,572	[1]	6,704	6,927	[1]
Regional capacity purchase	721	676	[1]	2,124	1,999	[1]
Landing fees and other rent	645	618	[1]	1,893	1,822	[1]
Depreciation and amortization	575	545	[1]	1,682	1,607	[1]
Aircraft maintenance materials and outside repairs	490	455	[1]	1,319	1,333	[1]
Distribution expenses	432	427	[1]	1,234	1,162	[1]
Aircraft rent	67	109	[1]	221	355	[1]
Special charges	27	17	[1]	116	186	[1]
Other operating expenses	1,591	1,467	[1]	4,645	4,293	[1]
Total operating expenses	9,907	9,816	[1]	28,931	28,218	[1]
Operating income	1,473	1,187	[1]	3,440	2,594	[1]
Nonoperating income (expense):
Interest expense	(191)	(172)	[1]	(570)	(497)	[1]
Interest capitalized	22	16	[1]	65	46	[1]
Interest income	36	28	[1]	103	70	[1]
Miscellaneous, net	9	(1)	[1]	32	(118)	[1]
Total nonoperating expense, net	(124)	(129)	[1]	(370)	(499)	[1]
Income before income taxes	1,349	1,058	[1]	3,070	2,095	[1]
Income tax expense	325	225	[1]	702	434	[1]
Net income	$ 1,024	$ 833	[1],[2],[3]	$ 2,368	$ 1,661	[1],[2],[3]
Earnings per share, basic (in dollars per share)	$ 4.01	$ 3.06	[1]	$ 9.07	$ 6.00	[1]
Earnings per share, diluted (in dollars per share)	$ 3.99	$ 3.05	[1]	$ 9.04	$ 5.98	[1]
United Airlines, Inc.
Operating revenue:
Operating revenue	$ 11,380	$ 11,003	[4]	$ 32,371	$ 30,812	[4]
Operating expense:
Salaries and related costs	3,063	2,930	[4]	8,993	8,534	[4]
Aircraft fuel	2,296	2,572	[4]	6,704	6,927	[4]
Regional capacity purchase	721	676	[4]	2,124	1,999	[4]
Landing fees and other rent	645	618	[4]	1,893	1,822	[4]
Depreciation and amortization	575	545	[4]	1,682	1,607	[4]
Aircraft maintenance materials and outside repairs	490	455	[4]	1,319	1,333	[4]
Distribution expenses	432	427	[4]	1,234	1,162	[4]
Aircraft rent	67	109	[4]	221	355	[4]
Special charges	27	17	[4]	116	186	[4]
Other operating expenses	1,590	1,467	[4]	4,643	4,292	[4]
Total operating expenses	9,906	9,816	[4]	28,929	28,217	[4]
Operating income	1,474	1,187	[4]	3,442	2,595	[4]
Nonoperating income (expense):
Interest expense	(191)	(172)	[4]	(570)	(497)	[4]
Interest capitalized	22	16	[4]	65	46	[4]
Interest income	36	28	[4]	103	70	[4]
Miscellaneous, net	9	(1)	[4]	32	(118)	[4]
Total nonoperating expense, net	(124)	(129)	[4]	(370)	(499)	[4]
Income before income taxes	1,350	1,058	[4]	3,072	2,096	[4]
Income tax expense	326	224	[4]	703	434	[4]
Net income	1,024	834	[4],[5]	2,369	1,662	[4],[5],[6]
Passenger revenue
Operating revenue:
Operating revenue	10,481	10,120	[1]	29,692	28,150	[1]
Passenger revenue | United Airlines, Inc.
Operating revenue:
Operating revenue	10,481	10,120	[4]	29,692	28,150	[4]
Cargo
Operating revenue:
Operating revenue	282	296	[1]	863	903	[1]
Cargo | United Airlines, Inc.
Operating revenue:
Operating revenue	282	296	[4]	863	903	[4]
Other operating revenue
Operating revenue:
Operating revenue	617	587	[1]	1,816	1,759	[1]
Other operating revenue | United Airlines, Inc.
Operating revenue:
Operating revenue	$ 617	$ 587	[4]	$ 1,816	$ 1,759	[4]

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

[2] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

[3] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

[4] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

[5] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

[6] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.