Condensed Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net cash provided by operating activities		$ 5,728	$ 5,035	[1]
Cash Flows from Investing Activities:
Capital expenditures		(3,336)	(2,496)	[1]
Purchases of short-term and other investments		(2,168)	(1,975)	[1]
Proceeds from sale of short-term and other investments		2,282	1,979	[1]
Investment in affiliates		(36)	(139)	[1]
Proceeds from sale of property and equipment		47	30	[1]
Loans made to affiliates		(10)	(10)	[1]
Other, net		(10)	104	[1]
Net cash used in investing activities		(3,231)	(2,507)	[1]
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt		1,109	1,241	[1]
Payments of long-term debt		(726)	(1,519)	[1]
Repurchases of common stock		(1,431)	(1,010)	[1]
Principal payments under finance leases		(105)	(57)	[1]
Capitalized financing costs		(51)	(31)	[1]
Other, net		(29)	(17)	[1]
Net cash used in financing activities		(1,233)	(1,393)	[1]
Net increase in cash, cash equivalents and restricted cash		1,264	1,135	[1]
Cash, cash equivalents and restricted cash at beginning of the period		1,799	1,591	[1]
Cash, cash equivalents and restricted cash at end of the period	[2]	3,063	2,726	[1]
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt		306	125	[1]
Operating lease conversions to finance lease		36	52	[1]
Right-of-use assets acquired through operating leases		344	537	[1]
Property and equipment acquired through finance leases		8	0	[1]
United Airlines, Inc.
Cash Flows from Operating Activities:
Net cash provided by operating activities		5,698	5,018	[3]
Cash Flows from Investing Activities:
Capital expenditures		(3,336)	(2,496)	[3]
Purchases of short-term and other investments		(2,168)	(1,975)	[3]
Proceeds from sale of short-term and other investments		2,282	1,979	[3]
Investment in affiliates		(36)	(139)	[3]
Proceeds from sale of property and equipment		47	30	[3]
Loans made to affiliates		(10)	(10)	[3]
Other, net		(10)	104	[3]
Net cash used in investing activities		(3,231)	(2,507)	[3]
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt		1,109	1,241	[3]
Payments of long-term debt		(726)	(1,519)	[3]
Dividend to UAL		(1,431)	(1,010)	[3]
Principal payments under finance leases		(105)	(57)	[3]
Capitalized financing costs		(51)	(31)	[3]
Other, net		1	0	[3]
Net cash used in financing activities		(1,203)	(1,376)	[3]
Net increase in cash, cash equivalents and restricted cash		1,264	1,135	[3]
Cash, cash equivalents and restricted cash at beginning of the period		1,793	1,585	[3]
Cash, cash equivalents and restricted cash at end of the period	[4]	3,057	2,720	[3]
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt		306	125	[3]
Operating lease conversions to finance lease		36	52	[3]
Right-of-use assets acquired through operating leases		344	537	[3]
Property and equipment acquired through finance leases		$ 8	$ 0	[3]

[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] The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet: Cash and cash equivalents $ 2,959
  $ 2,621
Restricted cash (included in Prepaid expenses and other) 4
  —
Restricted cash 100
  105
Total cash, cash equivalents and restricted cash $ 3,063
  $ 2,726

[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] The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet: Cash and cash equivalents $ 2,953
  $ 2,615
Restricted cash (included in Prepaid expenses and other) 4
  —
Restricted cash 100
  105
Total cash, cash equivalents and restricted cash $ 3,057
  $ 2,720