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RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS (Tables) | 3 Months Ended
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Mar. 31, 2018
Accounting Changes and Error Corrections [Abstract] |
Schedule of New Accounting Pronouncements Impact | Consolidated balance sheet as of December 31, 2017 (in millions):
| December 31, 2017
| As Reported |  | Adjustments - Revenue Recognition |  | As Adjusted
Current Assets: |  |  |  |  |
Prepaid expenses and other current assets | $ | 127 |  |  | $ | 6 |  |  | $ | 133 |
Current Liabilities: |  |  |  |  |
Air traffic liability | 937 |  |  | (131 | ) |  | 806 |
Deferred revenue | 518 |  |  | 117 |  |  | 635 |
Other liabilities and credits: |  |  |  |  |
Deferred income taxes | 454 |  |  | (84 | ) |  | 370 |
Deferred revenue | 699 |  |  | 391 |  |  | 1,090 |
Other liabilities | 451 |  |  | (26 | ) |  | 425 |
Shareholders' Equity: |  |  |  |  |
Retained earnings | 4,454 |  |  | (261 | ) |  | 4,193 |
Condensed consolidated statement of operations for the three months ended March 31, 2017 (in millions):
| Three Months Ended March 31, 2017
| As Reported |  | Adjustments - Revenue Recognition |  | Adjustments - Retirement Benefits |  | As Adjusted
Operating Revenues |  |  |  |  |  |  |
Passenger Revenue | $ | 1,484 |  |  | $ | 118 |  |  | $ | — |  |  | $ | 1,602 |
Mileage plan other revenue | 119 |  |  | (19 | ) |  | — |  |  | 100 |
Cargo and other revenue | 146 |  |  | (108 | ) |  | — |  |  | 38 |
Total Operating Revenue | 1,749 |  |  | (9 | ) |  | — |  |  | 1,740 |
Operating Expenses |  |  |  |  |  |  |
Wages and benefits | 448 |  |  | — |  |  | 2 |  |  | 450 |
Selling expenses | 81 |  |  | 2 |  |  | — |  |  | 83 |
Special items—merger-related costs | 40 |  |  | (1 | ) |  | — |  |  | 39 |
All other operating expenses | 1,011 |  |  | — |  |  | — |  |  | 1,011 |
Total Operating Expenses | 1,580 |  |  | 1 |  |  | 2 |  |  | 1,583 |
Operating Income | 169 |  |  | (10 | ) |  | (2 | ) |  | 157 |
Nonoperating Income (Expense) |  |  |  |  |  |  |
Other—net | (3 | ) |  | — |  |  | 2 |  |  | (1 | )
All other nonoperating income (expense) | (14 | ) |  | — |  |  | — |  |  | (14 | )
| (17 | ) |  | — |  |  | 2 |  |  | (15 | )
Income (loss) before income tax | 152 |  |  | (10 | ) |  | — |  |  | 142 |
Income tax expense (benefit) | 53 |  |  | (4 | ) |  | — |  |  | 49 |
Net Income (Loss) | $ | 99 |  |  | $ | (6 | ) |  | $ | — |  |  | $ | 93 |
Condensed consolidated statement of cash flows for the three months ended March 31, 2017 (in millions):
| Three Months Ended March 31, 2017
| As Reported |  | Adjustments - Revenue Recognition |  | As Adjusted
Cash flows from operating activities: |  |  |  |  |
Net income | $ | 99 |  |  | (6 | ) |  | $ | 93 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Depreciation and amortization | 90 |  |  | — |  |  | 90 |
Stock-based compensation and other | 13 |  |  | — |  |  | 13 |
Changes in certain assets and liabilities: |  |  |  |  |
Changes in deferred tax provision | 48 |  |  | (4 | ) |  | 44 |
Increase in air traffic liability | 369 |  |  | (5 | ) |  | 364 |
Increase in deferred revenue | 1 |  |  | 30 |  |  | 31 |
Other—net | (150 | ) |  | (15 | ) |  | (165 | )
Net cash provided by operating activities | 470 |  |  | — |  |  | 470 |
Net cash used in investing activities | (488 | ) |  | — |  |  | (488 | )
Net cash used in financing activities | (127 | ) |  | — |  |  | (127 | )
Net increase (decrease) in cash and cash equivalents | (145 | ) |  | — |  |  | (145 | )
Cash and cash equivalents at beginning of year | 328 |  |  | — |  |  | 328 |
Cash and cash equivalents at end of the period | $ | 183 |  |  | — |  |  | $ | 183 |

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