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Statements of Consolidated Stockholders' Equity - USD ($) $ in Millions | Total | Common Stock | Additional Capital Invested | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | United Airlines, Inc. | United Airlines, Inc. Additional Capital Invested | United Airlines, Inc. Retained Earnings | United Airlines, Inc. Accumulated Other Comprehensive Income (Loss) | United Airlines, Inc. Receivable from Related Parties, Net
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Balance (in shares) at Dec. 31, 2017 | [1] |  |  | 287,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 |  | $ 8,788 | [1] | $ 3 | [1] | $ 6,098 | [1] | $ (769) | [1] | $ 4,603 | [1] | $ (1,147) | [1] | $ 8,751 | [2] | $ 1,787 | [2] | $ 8,201 | [2] | $ (1,147) | [2] | $ (90) | [2]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 1,661 | [1],[3],[4] |  |  |  |  |  |  | 1,661 | [1] |  |  | 1,662 | [2],[5],[6] |  |  | 1,662 | [2] |  |  |  |
Other comprehensive income (loss) |  | 51 | [3] |  |  |  |  |  |  |  |  | 51 |  | 51 | [6] |  |  |  |  | 51 |  |  |
Dividend to UAL |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,010) |  | (1,010) |  |  |  |  |  |  |
Stock settled share-based compensation |  | 45 |  |  |  | 45 |  |  |  |  |  |  |  | 45 |  | 45 |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  | (14,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  | (1,010) |  |  |  |  |  | (1,010) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards |  | (17) |  |  |  | (38) |  | 26 |  | (5) |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | (19) |  |  |  | (7) |  | 7 |  | (19) |
Balance (in shares) at Sep. 30, 2018 | [1] |  |  | 272,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2018 |  | 9,518 | [1] | $ 3 | [1] | 6,105 | [1] | (1,753) | [1] | 6,252 | [1] | (1,089) | [1] | 9,480 | [2] | 822 | [2] | 9,856 | [2] | (1,089) | [2] | (109) | [2]
Balance (in shares) at Jun. 30, 2018 | [1] |  |  | 273,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2018 |  | 8,691 | [1] | $ 3 | [1] | 6,091 | [1] | (1,720) | [1] | 5,419 | [1] | (1,102) | [1] | 8,653 | [2] | 841 | [2] | 9,022 | [2] | (1,102) | [2] | (108) | [2]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 833 | [1],[3],[4] |  |  |  |  |  |  | 833 | [1] |  |  | 834 | [5],[6] |  |  | 834 |  |  |  |  |
Other comprehensive income (loss) |  | 13 | [3] |  |  |  |  |  |  |  |  | 13 |  | 13 | [6] |  |  |  |  | 13 |  |  |
Dividend to UAL |  |  |  |  |  |  |  |  |  |  |  |  |  | (34) |  | (34) |  |  |  |  |  |  |
Stock settled share-based compensation |  | 16 |  |  |  | 16 |  |  |  |  |  |  |  | 16 |  | 16 |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  | (500,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  | (34) |  |  |  |  |  | (34) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards |  | (1) |  |  |  | (2) |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  | (1) |  |  |  |  |  | (1) |
Balance (in shares) at Sep. 30, 2018 | [1] |  |  | 272,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2018 |  | $ 9,518 | [1] | $ 3 | [1] | 6,105 | [1] | (1,753) | [1] | 6,252 | [1] | (1,089) | [1] | $ 9,480 | [2] | 822 | [2] | 9,856 | [2] | (1,089) | [2] | (109) | [2]
Balance (in shares) at Dec. 31, 2018 |  | 269,914,769 |  | 269,900,000 | [1] |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 |  | $ 10,042 | [1],[7] | $ 3 | [1] | 6,120 | [1] | (1,993) | [1] | 6,715 | [1] | (803) | [1] | $ 10,004 | [2],[8] | 598 | [2] | 10,319 | [2] | (803) | [2] | (110) | [2]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 2,368 |  |  |  |  |  |  |  | 2,368 |  |  |  | 2,369 |  |  |  | 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) |  |  |  |  |  |  |  | (32) |
Balance (in shares) at Sep. 30, 2019 |  | 253,624,406 |  | 253,600,000 |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 |  | $ 11,301 |  | $ 3 |  | 6,111 |  | (3,384) |  | 9,075 |  | (504) |  | $ 11,263 |  | 0 |  | 11,909 |  | (504) |  | (142) |
Balance (in shares) at Jun. 30, 2019 |  |  |  | 257,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2019 |  | 10,320 |  | $ 3 |  | 6,096 |  | (3,022) |  | 8,050 |  | (807) |  | 10,282 |  | 0 |  | 11,230 |  | (807) |  | (141) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 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 |  | $ (1) |  |  |  | (3) |  | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1) |  |  |  |  |  |  |  | (1) |
Balance (in shares) at Sep. 30, 2019 |  | 253,624,406 |  | 253,600,000 |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Balance at Sep. 30, 2019 |  | $ 11,301 |  | $ 3 |  | $ 6,111 |  | $ (3,384) |  | $ 9,075 |  | $ (504) |  | $ 11,263 |  | $ 0 |  | $ 11,909 |  | $ (504) |  | $ (142) |
[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.
[7] | 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.
[8] | 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.

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