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Statements of Consolidated Stockholders' Equity (Unaudited) - USD ($) $ in Millions | Total | United Airlines, Inc. | Adoption of New Accounting Standard | [1] | Adoption of New Accounting Standard United Airlines, Inc. | [2] | Common Stock | Additional Capital Invested | Additional Capital Invested United Airlines, Inc. | Treasury Stock | 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.
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Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  | 269,900,000 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 10,042 |  | $ 10,004 |  |  | $ 3 |  | $ 6,120 | $ 598 | $ (1,993) | $ 6,715 | $ 10,319 |  |  | $ (803) | $ (803) | $ (110)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 2,368 |  | 2,369 |  |  |  |  |  |  |  | 2,368 | 2,369 |  |  |  |  |
Other comprehensive income (loss) | 299 |  | 299 |  |  |  |  |  |  |  |  |  |  |  | 299 | 299 |
Dividend to UAL |  |  | (1,426) |  |  |  |  |  | (647) |  |  | (779) |  |  |  |  |
Stock settled share-based compensation | 49 |  | 49 |  |  |  |  | 49 | 49 |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  |  | (16,800,000) |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock | (1,426) |  |  |  |  |  |  |  |  | (1,426) |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards | (31) |  |  |  |  |  |  | (58) |  | 35 | (8) |  |  |  |  |  |
Other |  |  | (32) |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 | (32)
Balance (in shares) at Sep. 30, 2019 |  |  |  |  |  | 253,600,000 |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 | 11,301 |  | 11,263 |  |  | $ 3 |  | 6,111 | 0 | (3,384) | 9,075 | 11,909 |  |  | (504) | (504) | (142)
Balance (in shares) at Jun. 30, 2019 |  |  |  |  |  | 257,700,000 |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2019 | 10,320 |  | 10,282 |  |  | $ 3 |  | 6,096 | 0 | (3,022) | 8,050 | 11,230 |  |  | (807) | (807) | (141)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 1,024 |  | 1,024 |  |  |  |  |  |  |  | 1,024 | 1,024 |  |  |  |  |
Other comprehensive income (loss) | 303 |  | 303 |  |  |  |  |  |  |  |  |  |  |  | 303 | 303 |
Dividend to UAL |  |  | (363) |  |  |  |  |  | (18) |  |  | (345) |  |  |  |  |
Stock settled share-based compensation | 18 |  | 18 |  |  |  |  | 18 | 18 |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  |  | (4,100,000) |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock | (363) |  |  |  |  |  |  |  |  | (363) |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards | (1) |  |  |  |  |  |  | (3) |  | 1 | 1 |  |  |  |  |  |
Other |  |  | (1) |  |  |  |  |  | 0 |  |  |  |  |  |  |  | (1)
Balance (in shares) at Sep. 30, 2019 |  |  |  |  |  | 253,600,000 |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 | $ 11,301 |  | $ 11,263 |  |  | $ 3 |  | 6,111 | 0 | (3,384) | 9,075 | 11,909 |  |  | (504) | (504) | (142)
Balance (in shares) at Dec. 31, 2019 | 251,216,381 |  | 1,000 |  |  | 251,200,000 | [1] |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ 11,531 | [1] | $ 11,492 | $ (17) | $ (17) | $ 3 |  | 6,129 | 0 | (3,599) | 9,716 | 12,353 | $ (17) | $ (17) | (718) | (718) | (143)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (5,172) |  | (5,171) |  |  |  |  |  |  |  | (5,172) | (5,171) |  |  |  |  |
Other comprehensive income (loss) | (291) |  | (291) |  |  |  |  |  |  |  |  |  |  |  | (291) | (291) |
Dividend to UAL |  |  | (342) |  |  |  |  |  | (12) |  |  | (330) |  |  |  |  |
Stock settled share-based compensation | 80 |  | 80 |  |  |  |  | 80 | 80 |  |  |  |  |  |  |  |
Sale of common stock (in shares) |  |  |  |  |  | 43,700,000 |  |  |  |  |  |  |  |  |  |  |
Sale of common stock | 1,135 |  |  |  |  |  |  | 1,135 |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  |  | (4,400,000) |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock | (342) |  |  |  |  |  |  |  |  | (342) |  |  |  |  |  |  |
Warrants issued | 97 |  |  |  |  |  |  | 97 |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards | $ (18) |  |  |  |  |  |  | (58) |  | 43 | (3) |  |  |  |  |  |
Other |  |  | $ 1,221 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,221
Balance (in shares) at Sep. 30, 2020 | 290,990,454 |  | 1,000 |  |  | 291,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2020 | $ 7,003 |  | $ 6,972 |  |  | $ 3 |  | 7,383 | 68 | (3,898) | 4,524 | 6,835 |  |  | (1,009) | (1,009) | 1,078
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2020 |  |  |  |  |  | 291,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2020 | $ 8,517 |  | $ 8,485 |  |  | $ 3 |  | 7,307 | 30 | (3,899) | 6,365 | 8,676 |  |  | (1,259) | (1,259) | 1,038
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (1,841) |  | (1,841) |  |  |  |  |  |  |  | (1,841) | (1,841) |  |  |  |  |
Other comprehensive income (loss) | 250 |  | 250 |  |  |  |  |  |  |  |  |  |  |  | 250 | 250 |
Stock settled share-based compensation | 38 |  | 38 |  |  |  |  | 38 | 38 |  |  |  |  |  |  |  |
Warrants issued | 40 |  |  |  |  |  |  | 40 |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards | $ (1) |  |  |  |  |  |  | (2) |  | 1 | 0 |  |  |  |  |  |
Other |  |  | $ 40 |  |  |  |  |  |  |  |  |  |  |  |  |  | 40
Balance (in shares) at Sep. 30, 2020 | 290,990,454 |  | 1,000 |  |  | 291,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2020 | $ 7,003 |  | $ 6,972 |  |  | $ 3 |  | $ 7,383 | $ 68 | $ (3,898) | $ 4,524 | $ 6,835 |  |  | $ (1,009) | $ (1,009) | $ 1,078
[1] | Transition adjustment due to the adoption of Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2] | Transition adjustment due to the adoption of Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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