Statements of Consolidated Stockholders' Equity (UA) - USD ($) $ in Millions	Total	United Airlines, Inc.	Adoption of New Accounting Standard	[1]	Adoption of New Accounting Standard United Airlines, Inc.	[2]	Additional Capital Invested	Additional Capital Invested United Airlines, Inc.	Retained Earnings	Retained Earnings United Airlines, Inc.	Retained Earnings Adoption of New Accounting Standard	[1]	Retained Earnings Adoption of New Accounting Standard United Airlines, Inc.	[2]	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) United Airlines, Inc.	(Receivable from) Payable to Related Parties, Net United Airlines, Inc.
Balance at Dec. 31, 2019	$ 11,531	$ 11,492	$ (17)		$ (17)		$ 6,129	$ 0	$ 9,716	$ 12,353	$ (17)		$ (17)		$ (718)	$ (718)	$ (143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(7,069)	(7,067)							(7,069)	(7,067)
Other comprehensive income (loss)	(421)	(421)													(421)	(421)
Dividend to UAL		(342)						(12)		(330)
Stock-settled share-based compensation	97	97					97	97
Impact of UAL common stock issuance	2,103	2,103					2,102										2,103
Other		83															83
Balance at Dec. 31, 2020	5,960	5,928					8,366	85	2,626	4,939					(1,139)	(1,139)	2,043
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,964)	(1,962)							(1,964)	(1,962)
Other comprehensive income (loss)	197	197													197	197
Stock-settled share-based compensation	232	232					232	232
Impact of UAL common stock issuance	532	532					532										532
Other		71															71
Balance at Dec. 31, 2021	5,029	4,998					9,156	317	625	2,977					(942)	(942)	2,646
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	737	739							737	739
Other comprehensive income (loss)	1,117	1,117													1,117	1,117
Stock-settled share-based compensation	86	86					86	86
Other		(75)															(75)
Balance at Dec. 31, 2022	$ 6,896	$ 6,865					$ 8,986	$ 403	$ 1,265	$ 3,716					$ 175	$ 175	$ 2,571

[1] Transition adjustment due to the adoption of Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses.

[2] Transition adjustment due to the adoption of Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses.