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Statements of Consolidated Stockholders' Equity - USD ($) $ in Millions | Total | United Airlines, Inc. | Common Stock | Additional Capital Invested | Additional Capital Invested United Airlines, Inc. | Treasury Stock | Retained Earnings | Retained Earnings United Airlines, Inc. | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) United Airlines, Inc. | Receivable from Related Parties, Net United Airlines, Inc.
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Balance (in shares) at Dec. 31, 2017 | [1] |  |  |  |  | 287,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 |  | $ 8,788 | [1] | $ 8,751 | [2] | $ 3 | [1] | $ 6,098 | [1] | $ 1,787 | [2] | $ (769) | [1] | $ 4,603 | [1] | $ 8,201 | [2] | $ (1,147) | [1] | $ (1,147) | [2] | $ (90) | [2]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 145 | [1],[3],[4] | 145 | [2],[5],[6] |  |  |  |  |  |  |  |  | 145 | [1] | 145 | [2] |  |  |  |  |  |
Other comprehensive income |  | 33 | [4] | 33 | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income |  | 26 |  | 26 |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 |  | 26 |  |  |
Dividend to UAL |  |  |  | (569) |  |  |  |  |  | (569) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock settled share-based compensation |  | 15 |  | 15 |  |  |  | 15 |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  |  | (7,800,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  | (569) |  |  |  |  |  |  |  |  |  | (569) |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards |  | (17) |  |  |  |  |  | (36) |  |  |  | 24 |  | (5) |  |  |  |  |  |  |  |  |
Other |  |  |  | (18) |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  |  | 7 |  | (18) |
Balance (in shares) at Mar. 31, 2018 | [1] |  |  |  |  | 279,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2018 |  | $ 8,388 | [1] | $ 8,350 | [2] | $ 3 | [1] | 6,077 | [1] | 1,233 | [2] | (1,314) | [1] | 4,736 | [1] | 8,339 | [2] | (1,114) | [1] | (1,114) | [2] | (108) | [2]
Balance (in shares) at Dec. 31, 2018 |  | 269,914,769 |  | 1,000 |  | 269,900,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 |  | $ 10,042 | [1],[7] | $ 10,004 | [2],[8] | $ 3 | [1] | 6,120 | [1] | 598 | [2] | (1,993) | [1] | 6,715 | [1] | 10,319 | [2] | (803) | [1] | (803) | [2] | (110) | [2]
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 292 |  | 293 |  |  |  |  |  |  |  |  |  | 292 |  | 293 |  |  |  |  |  |  |
Other comprehensive income |  | 10 |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  | 10 |  |  |
Dividend to UAL |  |  |  | (528) |  |  |  |  |  | (528) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock settled share-based compensation |  | 14 |  | 14 |  |  |  | 14 |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  |  | (6,100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock |  | (527) |  |  |  |  |  |  |  |  |  | (527) |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards (in shares) |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net treasury stock issued for share-based awards |  | $ (29) |  |  |  |  |  | (54) |  |  |  | 33 |  | (8) |  |  |  |  |  |  |  |  |
Other |  |  |  | $ (30) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (30) |
Balance (in shares) at Mar. 31, 2019 |  | 264,271,125 |  | 1,000 |  | 264,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2019 |  | $ 9,802 |  | $ 9,763 |  | $ 3 |  | $ 6,080 |  | $ 84 |  | $ (2,487) |  | $ 6,999 |  | $ 10,612 |  | $ (793) |  | $ (793) |  | $ (140) |
[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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