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EMPLOYEE BENEFIT PLANS - EMPLOYEE INCENTIVE-PAY PLANS (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / Quarter | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Variable incentive pay | $ | $ 135 | $ 127 | $ 120
Operational Performance Rewards Program entitles all Air Group employees to maximum quarterly payouts (in dollars per quarter) | $ / Quarter | 300 |  |

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