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Statements of Consolidated Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities:      
Net income $ 2,131 $ 2,263 $ 7,340
Adjustments to reconcile net income to net cash provided by operating activities -      
Deferred income taxes 945 1,648 (3,177)
Depreciation and amortization 2,149 1,977 1,819
Special charges, non-cashportion 35 391 247
Other operating activities 142 109 115
Changes in operating assets and liabilities -      
Decrease in fuel hedge collateral   26 551
Decrease in fuel derivatives   (20) (305)
Decrease in other liabilities (478) (446) (180)
Decrease in advanced purchase of miles (865) (249) (224)
Increase (decrease) in frequent flyer deferred revenue (142) (60) 6
Increase in other assets (533) (298) (160)
Increase (decrease) in accounts payable 66 239 (77)
Increase (decrease) in advance ticket sales 146 (22) 52
Increase in receivables (183) (16) (15)
Net cash provided by operating activities 3,413 5,542 5,992
Investing Activities:      
Capital expenditures (3,998) (3,223) (2,747)
Purchases of short-term and other investments (3,241) (2,768) (2,517)
Proceeds from sale of short-term and other investments 3,177 2,712 2,707
Proceeds from sale of property and equipment 12 28 86
Other, net 120 13 (136)
Net cash used in investing activities (3,930) (3,238) (2,607)
Financing Activities:      
Proceeds from issuance of long-term debt and airport construction financing 2,765 808 1,073
Repurchases of common stock (1,844) (2,614) (1,233)
Payments of long-term debt (901) (1,215) (2,178)
Principal payments under capital leases (124) (136) (123)
Capitalized financing costs (80) (64) (37)
Proceeds from the exercise of stock options 2 6 16
Other, net (13) 2 (13)
Net cash used in financing activities (195) (3,213) (2,495)
Net increase (decrease) in cash, cash equivalents and restricted cash (712) (909) 890
Cash, cash equivalents and restricted cash at beginning of year 2,303 3,212 2,322
Cash, cash equivalents and restricted cash at end of year 1,591 2,303 3,212
Investing and Financing Activities Not Affecting Cash:      
Property and equipment acquired through the issuance of debt and capital leases 935 386 866
Equity interest in Republic Airways Holdings, Inc. received in consideration for bankruptcy claims 92    
Airport construction financing 42 91 17
Operating lease conversions to capital lease   12 285
Exchange of convertible notes for common stock     202
Cash Paid During the Period for:      
Interest 571 584 660
Income taxes 20 14 15
United Airlines, Inc.      
Operating Activities:      
Net income 2,149 2,264 7,301
Adjustments to reconcile net income to net cash provided by operating activities -      
Deferred income taxes 929 1,650 (3,136)
Depreciation and amortization 2,149 1,977 1,819
Special charges, non-cashportion 35 391 247
Other operating activities 142 108 115
Changes in operating assets and liabilities -      
Decrease in fuel hedge collateral   26 551
Decrease in fuel derivatives   (20) (305)
Decrease in other liabilities (479) (444) (181)
Decrease in advanced purchase of miles (865) (249) (224)
Increase (decrease) in frequent flyer deferred revenue (142) (60) 6
Increase in other assets (533) (251) (160)
Increase (decrease) in accounts payable 66 239 (77)
Increase (decrease) in advance ticket sales 146 (22) 52
Increase in receivables (183) (16) (15)
Increase in intercompany receivables (15) (58) (12)
Net cash provided by operating activities 3,399 5,535 5,981
Investing Activities:      
Capital expenditures (3,998) (3,223) (2,747)
Purchases of short-term and other investments (3,241) (2,768) (2,517)
Proceeds from sale of short-term and other investments 3,177 2,712 2,707
Proceeds from sale of property and equipment 12 28 86
Other, net 120 13 (136)
Net cash used in investing activities (3,930) (3,238) (2,607)
Financing Activities:      
Proceeds from issuance of long-term debt and airport construction financing 2,765 808 1,073
Dividend to UAL (1,844) (2,614) (1,233)
Payments of long-term debt (901) (1,215) (2,178)
Principal payments under capital leases (124) (136) (123)
Capitalized financing costs (80) (64) (37)
Proceeds from the exercise of stock options 2 6 16
Other, net 1 9 (2)
Net cash used in financing activities (181) (3,206) (2,484)
Net increase (decrease) in cash, cash equivalents and restricted cash (712) (909) 890
Cash, cash equivalents and restricted cash at beginning of year 2,297 3,206 2,316
Cash, cash equivalents and restricted cash at end of year 1,585 2,297 3,206
Investing and Financing Activities Not Affecting Cash:      
Property and equipment acquired through the issuance of debt and capital leases 935 386 866
Equity interest in Republic Airways Holdings, Inc. received in consideration for bankruptcy claims 92    
Airport construction financing 42 91 17
Operating lease conversions to capital lease   12 285
Cash Paid During the Period for:      
Interest 571 584 660
Income taxes $ 20 $ 14 $ 15