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RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Changes and Error Corrections [Abstract] |
Schedule of New Accounting Pronouncements Impact | Condensed consolidated statement of operations for the three and six months ended June 30, 2017 (in millions):
| Three Months Ended June 30, 2017 |  | Six Months Ended June 30, 2017
|  |  | Adjustments |  |  |  |  |  | Adjustments |  |
| As Reported |  | Revenue Recognition |  | Retirement Benefits |  | As Adjusted |  | As Reported |  | Revenue Recognition |  | Retirement Benefits |  | As Adjusted
Operating Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger Revenue | $ | 1,807 |  |  | $ | 138 |  |  | $ | — |  |  | $ | 1,945 |  |  | $ | 3,291 |  |  | $ | 256 |  |  | $ | — |  |  | $ | 3,547 |
Mileage plan other revenue | 128 |  |  | (19 | ) |  | — |  |  | 109 |  |  | 247 |  |  | (38 | ) |  | — |  |  | 209 |
Cargo and other revenue | 167 |  |  | (119 | ) |  | — |  |  | 48 |  |  | 313 |  |  | (227 | ) |  | — |  |  | 86 |
Total Operating Revenue | 2,102 |  |  | — |  |  | — |  |  | 2,102 |  |  | 3,851 |  |  | (9 | ) |  | — |  |  | 3,842 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wages and benefits | 469 |  |  | — |  |  | 1 |  |  | 470 |  |  | 917 |  |  | — |  |  | 3 |  |  | 920 |
Selling expenses | 97 |  |  | 5 |  |  | — |  |  | 102 |  |  | 178 |  |  | 7 |  |  | — |  |  | 185 |
Special items—merger-related costs | 24 |  |  | — |  |  | — |  |  | 24 |  |  | 64 |  |  | (1 | ) |  | — |  |  | 63 |
All other operating expenses | 1,019 |  |  | — |  |  | — |  |  | 1,019 |  |  | 2,030 |  |  | — |  |  | — |  |  | 2,030 |
Total Operating Expenses | 1,609 |  |  | 5 |  |  | 1 |  |  | 1,615 |  |  | 3,189 |  |  | 6 |  |  | 3 |  |  | 3,198 |
Operating Income | 493 |  |  | (5 | ) |  | (1 | ) |  | 487 |  |  | 662 |  |  | (15 | ) |  | (3 | ) |  | 644 |
Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other—net | (1 | ) |  | — |  |  | 1 |  |  | — |  |  | (4 | ) |  | — |  |  | 3 |  |  | (1 | )
All other nonoperating income (expense) | (13 | ) |  | — |  |  | — |  |  | (13 | ) |  | (27 | ) |  | — |  |  | — |  |  | (27 | )
| (14 | ) |  | — |  |  | 1 |  |  | (13 | ) |  | (31 | ) |  | — |  |  | 3 |  |  | (28 | )
Income (loss) before income tax | 479 |  |  | (5 | ) |  | — |  |  | 474 |  |  | 631 |  |  | (15 | ) |  | — |  |  | 616 |
Income tax expense (benefit) | 183 |  |  | (2 | ) |  | — |  |  | 181 |  |  | 236 |  |  | (6 | ) |  | — |  |  | 230 |
Net Income (Loss) | $ | 296 |  |  | $ | (3 | ) |  | $ | — |  |  | $ | 293 |  |  | $ | 395 |  |  | $ | (9 | ) |  | $ | — |  |  | $ | 386 |
Condensed consolidated statement of cash flows for the six months ended June 30, 2017 (in millions):
| Six Months Ended June 30, 2017
| As Reported |  | Adjustments - Revenue Recognition |  | As Adjusted
Cash flows from operating activities: |  |  |  |  |
Net income | $ | 395 |  |  | $ | (9 | ) |  | $ | 386 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |
Depreciation and amortization | 180 |  |  | — |  |  | 180 |
Stock-based compensation and other | 25 |  |  | — |  |  | 25 |
Changes in certain assets and liabilities: |  |  |  |  |
Changes in deferred tax provision | 132 |  |  | (5 | ) |  | 127 |
Increase in air traffic liability | 406 |  |  | (22 | ) |  | 384 |
Increase in deferred revenue | 15 |  |  | 54 |  |  | 69 |
Other—net | (69 | ) |  | (18 | ) |  | (87 | )
Net cash provided by operating activities | 1,084 |  |  | — |  |  | 1,084 |
Net cash used in investing activities | (971 | ) |  | — |  |  | (971 | )
Net cash used in financing activities | (243 | ) |  | — |  |  | (243 | )
Net increase (decrease) in cash and cash equivalents | (130 | ) |  | — |  |  | (130 | )
Cash and cash equivalents at beginning of year | 328 |  |  | — |  |  | 328 |
Cash and cash equivalents at end of the period | $ | 198 |  |  | $ | — |  |  | $ | 198 |

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