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Statements of Consolidated Stockholder's Equity - USD ($) $ in Millions | Total | United Airlines, Inc. | Common Stock | Additional Capital Invested | Additional Capital Invested United Airlines, Inc. | Treasury Stock | Retained Earnings (Accumulated Deficit) | Retained Earnings (Accumulated Deficit) United Airlines, Inc. | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) United Airlines, Inc. | Receivable from Related Parties, Net United Airlines, Inc.
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2015 |  |  |  |  | 364,600,000 |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2015 | $ 8,966 |  | $ 8,963 |  | $ 4 | $ 7,946 | $ 6,138 | $ (1,610) | $ 3,457 |  | $ 3,673 |  | $ (831) | $ (831) | $ (17)
Net income | 2,234 | [1],[2],[3],[4] | 2,234 | [5],[6],[7] |  |  |  |  | 2,234 | [4] | 2,234 | [7],[8] |  |  |
Other comprehensive income (loss) | 2 |  | 2 | [5] |  |  |  |  |  |  |  |  | 2 | 2 |
Stock-settled share-based compensation | 32 |  | 32 |  |  | 32 | 32 |  |  |  |  |  |  |  |
Dividend to UAL |  |  | (2,603) |  |  |  | (2,603) |  |  |  |  |  |  |  |
Proceeds from exercise of stock options / net treasury stock issued for share-based awards (in shares) |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of stock options | 6 |  |  |  |  | 6 |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  | (50,300,000) |  |  |  |  |  |  |  |  |  |
Repurchases of common stock | (2,607) |  |  |  |  |  |  | (2,607) |  |  |  |  |  |  |
Treasury stock retired |  |  |  |  | $ (1) | (1,415) |  | 3,709 | (2,293) |  |  |  |  |  |
UAL contribution related to stock plans |  |  | 6 |  |  |  | 6 |  |  |  |  |  |  |  |
Other | (59) |  | (114) |  |  |  |  | (3) | (56) |  | (56) |  |  |  | (58)
Balance (in shares) at Dec. 31, 2016 |  |  |  |  | 314,600,000 |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2016 | 8,574 |  | 8,520 |  | $ 3 | 6,569 | 3,573 | (511) | 3,342 |  | 5,851 |  | (829) | (829) | (75)
Net income | 2,144 | [1],[2],[3],[4] | 2,163 | [5],[6],[7] |  |  |  |  | 2,144 | [4] | 2,163 | [7],[8] |  |  |
Other comprehensive income (loss) | (200) |  | (200) | [5] |  |  |  |  |  |  |  |  | (200) | (200) |
Stock-settled share-based compensation | 56 |  | 56 |  |  | 56 | 56 |  |  |  |  |  |  |  |
Dividend to UAL |  |  | (1,844) |  |  |  | (1,844) |  |  |  |  |  |  |  |
Proceeds from exercise of stock options / net treasury stock issued for share-based awards (in shares) |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of stock options | 2 |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  |  |  | (27,800,000) |  |  |  |  |  |  |  |  |  |
Repurchases of common stock | (1,844) |  |  |  |  |  |  | (1,844) |  |  |  |  |  |  |
Treasury stock retired |  |  |  |  |  | (508) |  | 1,576 | (1,068) |  |  |  |  |  |
Net treasury stock issued for share-based awards | $ (12) |  |  |  |  | (21) |  | 10 | (1) |  |  |  |  |  |
UAL contribution related to stock plans |  |  | 2 |  |  |  | 2 |  |  |  |  |  |  |  |
Reclassification of stranded tax effects |  |  |  |  |  |  |  |  | 118 |  | 118 |  | (118) | (118) |
Other |  |  | $ (15) |  |  |  |  |  |  |  |  |  |  |  | (15)
Balance (in shares) at Dec. 31, 2017 | 286,973,195 | [9] | 1,000 | [10] | 287,000,000 |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 8,734 | [9] | $ 8,696 | [10] | $ 3 | 6,098 | 1,787 | (769) | 4,549 |  | 8,146 |  | (1,147) | (1,147) | (90)
Net income | 2,129 |  | 2,131 |  |  |  |  |  | 2,129 |  | 2,131 |  |  |  |
Other comprehensive income (loss) | 338 |  | 338 |  |  |  |  |  |  |  |  |  | 338 | 338 |
Stock-settled share-based compensation | $ 60 |  | 60 |  |  | 60 | 60 |  |  |  |  |  |  |  |
Dividend to UAL |  |  | (1,249) |  |  |  | (1,249) |  |  |  |  |  |  |  |
Proceeds from exercise of stock options / net treasury stock issued for share-based awards (in shares) |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) | (17,500,000) |  |  |  | (17,500,000) |  |  |  |  |  |  |  |  |  |
Repurchases of common stock | $ (1,250) |  |  |  |  |  |  | (1,250) |  |  |  |  |  |  |
Net treasury stock issued for share-based awards | $ (16) |  |  |  |  | (38) |  | 26 | (4) |  |  |  |  |  |
Other |  |  | $ (19) |  |  |  |  |  |  |  | (5) |  |  | 6 | (20)
Balance (in shares) at Dec. 31, 2018 | 269,914,769 |  | 1,000 |  | 269,900,000 |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 9,995 |  | $ 9,957 |  | $ 3 | $ 6,120 | $ 598 | $ (1,993) | $ 6,668 |  | $ 10,272 |  | $ (803) | $ (803) | $ (110)
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[2] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[3] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[4] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[5] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[6] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[7] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[8] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[9] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[10] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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