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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - MILEAGE PLAN (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Mileage Plan [Line Items] |  |  |
Other accrued liabilities | $ 661 | $ 585 |
Other liabilities | 362 | 327 |
Deferred revenue | 431 | 374 |
Deferred revenue from Mileage Plan awards issued but not yet flown | 37 | 33 |
Passenger revenues | 4,793 | 4,579 | $ 4,267
Other-net revenues | 697 | 675 | 584
Special Revenue | 0 | 0 | 192
Total Operating Revenues | 5,598 | 5,368 | 5,156
Revenue From Mileage Plan [Member] |  |  |
Mileage Plan [Line Items] |  |  |
Passenger revenues | 267 | 246 | 208
Other-net revenues | 329 | 295 | 256
Special Revenue | 0 | 0 | 192
Total Operating Revenues | 596 | 541 | 656
Commission revenue | 280 | 261 | $ 213
Liabilities From Mileage Plan [Member] |  |  |
Mileage Plan [Line Items] |  |  |
Other accrued liabilities | 368 | 343 |
Other liabilities | 19 | 20 |
Deferred revenue | 427 | 367 |
Liabilities | $ 814 | $ 730 |

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