Condensed Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities:
Net cash provided (used) by operating activities		$ (67)	$ 4,625
Cash Flows from Investing Activities:
Capital expenditures, net of returns of purchase deposits on flight equipment		(1,998)	(2,467)
Purchases of short-term and other investments		(550)	(1,443)
Proceeds from sale of short-term and other investments		1,774	1,484
Other, net		14	(10)
Net cash used in investing activities		(760)	(2,436)
Cash Flows from Financing Activities:
Proceeds from issuance of short-term debt		2,750	0
Proceeds from issuance of long-term debt		1,669	996
Proceeds from equity issuance		1,135	0
Payments of long-term debt		(523)	(473)
Repurchases of common stock		(353)	(1,062)
Principal payments under finance leases		(41)	(63)
Capitalized financing costs		(48)	(30)
Other, net		(18)	(30)
Net cash provided (used) in financing activities		4,571	(662)
Net increase in cash, cash equivalents and restricted cash		3,744	1,527
Cash, cash equivalents and restricted cash at beginning of the period		2,868	1,799
Cash, cash equivalents and restricted cash at end of the period	[1]	6,612	3,326
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt		327	220
Property and equipment acquired through other financial liabilities		280	0
Lease modifications and lease conversions		470	36
Right-of-use assets acquired through operating leases		48	99
Property and equipment acquired through finance leases		19	8
United Airlines, Inc.
Cash Flows from Operating Activities:
Net cash provided (used) by operating activities		(78)	4,596
Cash Flows from Investing Activities:
Capital expenditures, net of returns of purchase deposits on flight equipment		(1,998)	(2,467)
Purchases of short-term and other investments		(550)	(1,443)
Proceeds from sale of short-term and other investments		1,774	1,484
Other, net		14	(10)
Net cash used in investing activities		(760)	(2,436)
Cash Flows from Financing Activities:
Proceeds from issuance of short-term debt		2,750	0
Proceeds from issuance of long-term debt		1,669	996
Proceeds from equity issuance		1,135	0
Payments of long-term debt		(523)	(473)
Dividend to UAL		(353)	(1,062)
Principal payments under finance leases		(41)	(63)
Capitalized financing costs		(48)	(30)
Other, net		(1)	(1)
Net cash provided (used) in financing activities		4,588	(633)
Net increase in cash, cash equivalents and restricted cash		3,750	1,527
Cash, cash equivalents and restricted cash at beginning of the period		2,862	1,793
Cash, cash equivalents and restricted cash at end of the period	[2]	6,612	3,320
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt		327	220
Property and equipment acquired through other financial liabilities		280	0
Lease modifications and lease conversions		470	36
Right-of-use assets acquired through operating leases		48	99
Property and equipment acquired through finance leases		$ 19	$ 8

[1] 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 $ 6,505
  $ 3,221
Restricted cash (included in Prepaid expenses and other) 34
  —
Restricted cash 73
  105
Total cash, cash equivalents and restricted cash $ 6,612
  $ 3,326

[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 $ 6,505
  $ 3,215
Restricted cash (included in Prepaid expenses and other) 34
  —
Restricted cash 73
  105
Total cash, cash equivalents and restricted cash $ 6,612
  $ 3,320