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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - MILEAGE PLAN (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Mileage Plan [Line Items] |  |  |
Other accrued liabilities | $ 878 | $ 661 |
Other liabilities | 417 | 362 |
Deferred revenue | 640 | 431 |
Deferred revenue from Mileage Plan awards issued but not yet flown | 43 | 37 |
Passenger revenues | 5,006 | 4,793 | $ 4,579
Other-net revenues | 817 | 697 | 675
Total Operating Revenues | 5,931 | 5,598 | 5,368
Revenue From Mileage Plan [Member] |  |  |
Mileage Plan [Line Items] |  |  |
Passenger revenues | 293 | 267 | 246
Other-net revenues | 429 | 329 | 295
Total Operating Revenues | 722 | 596 | 541
Commission revenue | 329 | 280 | $ 261
Liabilities From Mileage Plan [Member] |  |  |
Mileage Plan [Line Items] |  |  |
Other accrued liabilities | 484 | 368 |
Other liabilities | 21 | 19 |
Deferred revenue | 638 | 427 |
Liabilities | $ 1,143 | $ 814 |

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