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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 |  | 828 | [1],[3],[4] |  |  |  |  |  |  | 828 | [1] |  |  | 828 | [2],[5],[6] |  |  | 828 |  |  |  |  |
Other comprehensive income (loss) |  | 38 | [4] |  |  |  |  |  |  |  |  | 38 |  | 38 | [5] |  |  |  |  | 38 |  |  |
Dividend to UAL |  |  |  |  |  |  |  |  |  |  |  |  |  | (976) |  | (976) |  |  |  |  |  |  |
Stock settled share-based compensation |  | 29 |  |  |  | 29 |  |  |  |  |  |  |  | 29 |  | 29 |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  | (14,200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  | (976) |  |  |  |  |  | (976) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards |  | (16) |  |  |  | (36) |  | 25 |  | (5) |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | (17) |  | 1 |  | (7) |  | 7 |  | (18) |
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]
Balance (in shares) at Mar. 31, 2018 | [1] |  |  | 279,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2018 |  | 8,388 | [1] | $ 3 | [1] | 6,077 | [1] | (1,314) | [1] | 4,736 | [1] | (1,114) | [1] | 8,350 | [2] | 1,233 | [2] | 8,339 | [2] | (1,114) | [2] | (108) | [2]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 683 | [1],[3],[4] |  |  |  |  |  |  | 683 | [1] |  |  | 683 | [5],[6] |  |  | 683 |  |  |  |  |
Other comprehensive income (loss) |  | 12 | [4] |  |  |  |  |  |  |  |  | 12 |  | 12 | [5] |  |  |  |  | 12 |  |  |
Dividend to UAL |  |  |  |  |  |  |  |  |  |  |  |  |  | (407) |  | (407) |  |  |  |  |  |  |
Stock settled share-based compensation |  | 14 |  |  |  | 14 |  |  |  |  |  |  |  | 14 |  | 14 |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  | (6,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  | (407) |  |  |  |  |  | (407) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards |  | 1 |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |  |
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]
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 |  | 1,344 |  |  |  |  |  |  |  | 1,344 |  |  |  | 1,345 |  |  |  | 1,345 |  |  |  |  |
Other comprehensive income (loss) |  | (4) |  |  |  |  |  |  |  |  |  | (4) |  | (4) |  |  |  |  |  | (4) |  |  |
Dividend to UAL |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,063) |  | (629) |  | (434) |  |  |  |  |
Stock settled share-based compensation |  | 31 |  |  |  | 31 |  |  |  |  |  |  |  | 31 |  | 31 |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  | (12,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  | (1,063) |  |  |  |  |  | (1,063) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards |  | $ (30) |  |  |  | (55) |  | 34 |  | (9) |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (31) |  |  |  |  |  |  |  | (31) |
Balance (in shares) at Jun. 30, 2019 |  | 257,729,166 |  | 257,700,000 |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2019 |  | $ 10,320 |  | $ 3 |  | 6,096 |  | (3,022) |  | 8,050 |  | (807) |  | $ 10,282 |  | 0 |  | 11,230 |  | (807) |  | (141) |
Balance (in shares) at Mar. 31, 2019 |  |  |  | 264,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2019 |  | 9,802 |  | $ 3 |  | 6,080 |  | (2,487) |  | 6,999 |  | (793) |  | 9,763 | [2] | 84 | [2] | 10,612 | [2] | (793) | [2] | (140) | [2]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 1,052 |  |  |  |  |  |  |  | 1,052 |  |  |  | 1,052 |  |  |  | 1,052 |  |  |  |  |
Other comprehensive income (loss) |  | (14) |  |  |  |  |  |  |  |  |  | (14) |  | (14) |  |  |  |  |  | (14) |  |  |
Dividend to UAL |  |  |  |  |  |  |  |  |  |  |  |  |  | (536) |  | (102) |  | (434) |  |  |  |  |
Stock settled share-based compensation |  | 17 |  |  |  | 17 |  |  |  |  |  |  |  | 17 |  | 17 |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  | (6,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  | (536) |  |  |  |  |  | (536) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards |  | $ (1) |  |  |  | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 1 |  |  |  |  |  | (1) |
Balance (in shares) at Jun. 30, 2019 |  | 257,729,166 |  | 257,700,000 |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Balance at Jun. 30, 2019 |  | $ 10,320 |  | $ 3 |  | $ 6,096 |  | $ (3,022) |  | $ 8,050 |  | $ (807) |  | $ 10,282 |  | $ 0 |  | $ 11,230 |  | $ (807) |  | $ (141) |
[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. The accompanying Combined Notes to Condensed Consolidated Financial Statements are an integral part of these statements.
[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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