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Statements of Consolidated Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities:      
Net income $ 2,129 $ 2,144 [1],[2],[3],[4] $ 2,234 [1],[2],[3],[4]
Adjustments to reconcile net income to net cash provided by operating activities -      
Deferred income taxes 515 973 [3] 1,631 [3]
Depreciation and amortization 2,240 2,149 [1],[3] 1,977 [1],[3]
Special charges, non-cash portion 416 35 [3] 391 [3]
Other operating activities 170 141 [3] 109 [3]
Changes in operating assets and liabilities -      
Increase in receivables (29) (183) [3] (16) [3]
(Increase) decrease in other assets 29 (533) [3] (296) [3]
Increase (decrease) in advance ticket sales 441 145 [3] (28) [3]
Increase (decrease) in frequent flyer deferred revenue 222 (107) [3] (55) [3]
Increase in accounts payable 130 66 [3] 239 [3]
Decrease in advanced purchase of miles 0 (942) [3] (206) [3]
Decrease in other liabilities (82) (475) [3] (438) [3]
Net cash provided by operating activities 6,181 3,413 [3] 5,542 [3]
Investing Activities:      
Capital expenditures (4,177) (3,998) [3] (3,223) [3]
Purchases of short-term and other investments (2,552) (3,241) [3] (2,768) [3]
Proceeds from sale of short-term and other investments 2,616 3,177 [3] 2,712 [3]
Loans made to others (466) (30) [3] (56) [3]
Investment in affiliates (139) (2) [3] (14) [3]
Other, net 155 164 [3] 111 [3]
Net cash used in investing activities (4,563) (3,930) [3] (3,238) [3]
Financing Activities:      
Proceeds from issuance of long-term debt and airport construction financing 1,740 2,765 [3] 808 [3]
Payments of long-term debt (1,727) (901) [3] (1,215) [3]
Repurchases of common stock (1,235) (1,844) [3] (2,614) [3]
Principal payments under capital leases (134) (124) [3] (136) [3]
Capitalized financing costs (37) (80) [3] (64) [3]
Other, net (17) (11) [3] 8 [3]
Net cash used in financing activities (1,410) (195) [3] (3,213) [3]
Net increase (decrease) in cash, cash equivalents and restricted cash 208 (712) [3] (909) [3]
Cash, cash equivalents and restricted cash at beginning of year [3] 1,591 2,303 3,212
Cash, cash equivalents and restricted cash at end of year 1,799 1,591 [3] 2,303 [3]
Investing and Financing Activities Not Affecting Cash:      
Property and equipment acquired through the issuance of debt and capital leases 174 935 [3] 386 [3]
Debt associated with termination of a maintenance service agreement 163 0 [3] 0 [3]
Investment in Republic Airways Holdings, Inc. received from bankruptcy claims 0 92 [3] 0 [3]
Airport construction financing 12 42 [3] 91 [3]
Operating lease conversions to capital lease 52 0 [3] 12 [3]
Cash Paid During the Period for:      
Interest 651 571 [3] 584 [3]
Income taxes 19 20 [3] 14 [3]
United Airlines, Inc.      
Operating Activities:      
Net income 2,131 2,163 [5],[6],[7] 2,234 [5],[6],[7]
Adjustments to reconcile net income to net cash provided by operating activities -      
Deferred income taxes 515 956 [6] 1,633 [6]
Depreciation and amortization 2,240 2,149 [6],[8] 1,977 [6],[8]
Special charges, non-cash portion 416 35 [6] 391 [6]
Other operating activities 170 140 [6] 109 [6]
Changes in operating assets and liabilities -      
Increase in receivables (29) (183) [6] (16) [6]
Increase in intercompany receivables (20) (15) [6] (57) [6]
(Increase) decrease in other assets 29 (533) [6] (250) [6]
Increase (decrease) in advance ticket sales 441 145 [6] (28) [6]
Increase (decrease) in frequent flyer deferred revenue 222 (107) [6] (55) [6]
Increase in accounts payable 130 66 [6] 239 [6]
Decrease in advanced purchase of miles 0 (942) [6] (206) [6]
Decrease in other liabilities (82) (475) [6] (436) [6]
Net cash provided by operating activities 6,163 3,399 [6] 5,535 [6]
Investing Activities:      
Capital expenditures (4,177) (3,998) [6] (3,223) [6]
Proceeds from sale of short-term and other investments (2,552) (3,241) [6] (2,768) [6]
Proceeds from sale of short-term and other investments 2,616 3,177 [6] 2,712 [6]
Loans made to others (466) (30) [6] (56) [6]
Investment in affiliates (139) (2) [6] (14) [6]
Other, net 155 164 [6] 111 [6]
Net cash used in investing activities (4,563) (3,930) [6] (3,238) [6]
Financing Activities:      
Proceeds from issuance of long-term debt and airport construction financing 1,740 2,765 [6] 808 [6]
Payments of long-term debt (1,727) (901) [6] (1,215) [6]
Dividend to UAL (1,235) (1,844) [6] (2,614) [6]
Principal payments under capital leases (134) (124) [6] (136) [6]
Capitalized financing costs (37) (80) [6] (64) [6]
Other, net 1 3 [6] 15 [6]
Net cash used in financing activities (1,392) (181) [6] (3,206) [6]
Net increase (decrease) in cash, cash equivalents and restricted cash 208 (712) [6] (909) [6]
Cash, cash equivalents and restricted cash at beginning of year [6] 1,585 2,297 3,206
Cash, cash equivalents and restricted cash at end of year 1,793 1,585 [6] 2,297 [6]
Investing and Financing Activities Not Affecting Cash:      
Property and equipment acquired through the issuance of debt and capital leases 174 935 [6] 386 [6]
Debt associated with termination of a maintenance service agreement 163 0 [6] 0 [6]
Investment in Republic Airways Holdings, Inc. received from bankruptcy claims 0 92 [6] 0 [6]
Airport construction financing 12 42 [6] 91 [6]
Operating lease conversions to capital lease 52 0 [6] 12 [6]
Cash Paid During the Period for:      
Interest 651 571 [6] 584 [6]
Income taxes $ 19 $ 20 [6] $ 14 [6]
[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.