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Statements of Consolidated Cash Flows - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Activities:      
Net income $ 3,009 $ 2,122 [1],[2],[3],[4] $ 2,143 [1],[2],[3],[4]
Adjustments to reconcile net income to net cash provided by operating activities -      
Deferred income taxes 882 512 [3] 957 [3]
Depreciation and amortization 2,288 2,165 [3],[4] 2,096 [3],[4]
Special charges, non-cash portion 175 416 [3] 35 [3]
Unrealized (gains) losses on investments (153) 5 [3],[4] 0 [3],[4]
Other operating activities 185 161 [3] 142 [3]
Changes in operating assets and liabilities -      
(Increase) decrease in receivables 44 17 [3] (73) [3]
(Increase) decrease in other assets (252) 265 [3] (432) [3]
Increase in advance ticket sales 438 441 [3] 145 [3]
Increase (decrease) in frequent flyer deferred revenue 271 222 [3] (107) [3]
Increase in accounts payable 324 130 [3] 66 [3]
Decrease in advanced purchase of miles 0 0 [3] (942) [3]
Decrease in other liabilities (302) (292) [3] (556) [3]
Net cash provided by operating activities 6,909 6,164 [3] 3,474 [3]
Investing Activities:      
Capital expenditures (4,528) (4,070) [3] (3,870) [3]
Purchases of short-term and other investments (2,897) (2,552) [3] (3,241) [3]
Proceeds from sale of short-term and other investments 2,996 2,616 [3] 3,177 [3]
Loans made to others (174) (466) [3] (30) [3]
Investment in affiliates (36) (139) [3] (2) [3]
Other, net 79 156 [3] 163 [3]
Net cash used in investing activities (4,560) (4,455) [3] (3,803) [3]
Financing Activities:      
Repurchases of common stock (1,645) (1,235) [3] (1,844) [3]
Proceeds from issuance of long-term debt 1,847 1,594 [3] 2,537 [3]
Payments of long-term debt (1,240) (1,727) [3] (901) [3]
Principal payments under finance leases (151) (79) [3] (84) [3]
Capitalized financing costs (61) (37) [3] (80) [3]
Other, net (30) (17) [3] (11) [3]
Net cash used in financing activities (1,280) (1,501) [3] (383) [3]
Net increase (decrease) in cash, cash equivalents and restricted cash 1,069 208 [3] (712) [3]
Cash, cash equivalents and restricted cash at beginning of year [3] 1,799 1,591 2,303
Cash, cash equivalents and restricted cash at end of year 2,868 1,799 [3] 1,591 [3]
Investing and Financing Activities Not Affecting Cash:      
Property and equipment acquired through the issuance of debt 493 143 [3] 897 [3]
Right-of-use assets acquired through operating leases 498 663 [3] 319 [3]
Property and equipment acquired through finance lease 22 17 [3] 16 [3]
Lease modifications and lease conversions (2) 52 [3] 0 [3]
Debt associated with termination of a maintenance service agreement 0 163 [3] 0 [3]
Investment in Republic Airways Holdings Inc. received from bankruptcy claims 0 0 [3] 92 [3]
Cash Paid During the Period for:      
Interest 648 651 [3] 571 [3]
Income taxes 29 19 [3] 20 [3]
United Airlines, Inc.      
Operating Activities:      
Net income 3,011 2,123 [5],[6],[7],[8] 2,161 [5],[6],[7],[8]
Adjustments to reconcile net income to net cash provided by operating activities -      
Deferred income taxes 882 513 [5] 941 [5]
Depreciation and amortization 2,288 2,165 [5],[7] 2,096 [5],[7]
Special charges, non-cash portion 175 416 [5] 35 [5]
Unrealized (gains) losses on investments (153) 5 [5],[7] 0 [5],[7]
Other operating activities 186 162 [5] 141 [5]
Changes in operating assets and liabilities -      
(Increase) decrease in receivables 44 17 [5] (73) [5]
Increase in intercompany receivables (33) (20) [5] (15) [5]
(Increase) decrease in other assets (252) 265 [5] (432) [5]
Increase in advance ticket sales 438 441 [5] 145 [5]
Increase (decrease) in frequent flyer deferred revenue 271 222 [5] (107) [5]
Increase in accounts payable 324 130 [5] 66 [5]
Decrease in advanced purchase of miles 0 0 [5] (942) [5]
Decrease in other liabilities (302) (293) [5] (556) [5]
Net cash provided by operating activities 6,879 6,146 [5] 3,460 [5]
Investing Activities:      
Capital expenditures (4,528) (4,070) [5] (3,870) [5]
Purchases of short-term and other investments (2,897) (2,552) [5] (3,241) [5]
Proceeds from sale of short-term and other investments 2,996 2,616 [5] 3,177 [5]
Loans made to others (174) (466) [5] (30) [5]
Investment in affiliates (36) (139) [5] (2) [5]
Other, net 79 156 [5] 163 [5]
Net cash used in investing activities (4,560) (4,455) [5] (3,803) [5]
Financing Activities:      
Proceeds from issuance of long-term debt 1,847 1,594 [5] 2,537 [5]
Payments of long-term debt (1,240) (1,727) [5] (901) [5]
Dividend to UAL (1,645) (1,235) [5] (1,844) [5]
Principal payments under finance leases (151) (79) [5] (84) [5]
Capitalized financing costs (61) (37) [5] (80) [5]
Other, net 0 1 [5] 3 [5]
Net cash used in financing activities (1,250) (1,483) [5] (369) [5]
Net increase (decrease) in cash, cash equivalents and restricted cash 1,069 208 [5] (712) [5]
Cash, cash equivalents and restricted cash at beginning of year [5] 1,793 1,585 2,297
Cash, cash equivalents and restricted cash at end of year 2,862 1,793 [5] 1,585 [5]
Investing and Financing Activities Not Affecting Cash:      
Property and equipment acquired through the issuance of debt 493 143 [5] 897 [5]
Right-of-use assets acquired through operating leases 498 663 [5] 319 [5]
Property and equipment acquired through finance lease 22 17 [5] 16 [5]
Lease modifications and lease conversions [5]   52 0
Debt associated with termination of a maintenance service agreement 0 163 [5] 0 [5]
Investment in Republic Airways Holdings Inc. received from bankruptcy claims 0 0 [5] 92 [5]
Cash Paid During the Period for:      
Interest 648 651 [5] 571 [5]
Income taxes $ 29 $ 19 [5] $ 20 [5]
[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 II, Item 8
[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 II, Item 8 of this report for additional information.
[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 II, Item 8 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 II, Item 8 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 II, Item 8 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 II, Item 8 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 II, Item 8 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 II, Item 8 of this report for additional information.