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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Mileage plan other revenue | $ 107 | $ 100
Passenger Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,685 | 1,602
Passenger Revenue [Member] | Passenger ticket revenue, including ticket breakage and net of taxes and fees [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,428 | 1,358
Passenger Revenue [Member] | Passenger ancillary revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 118 | 116
Passenger Revenue [Member] | Mileage Plan passenger revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 139 | 128
Mileage Plan Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 246 | 228
Mileage Plan Revenue [Member] | Passenger revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 139 | 128
Mileage Plan Revenue [Member] | Mileage plan other revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Mileage plan other revenue | 107 | 100
Cargo and Other Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 40 | 38
Cargo and Other Revenue [Member] | Cargo revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 26 | 24
Cargo and Other Revenue [Member] | Other revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 14 | $ 14

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- Definition Mileage Plan Revenue + References No definition available. + Details
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- Definition Revenue from Contract with Customer, Excluding Assessed Tax + References No definition available. + Details
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- Details
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- Details
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Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Period Type: |