XML 39 R20.htm IDEA: XBRL DOCUMENT
v3.8.0.1

New Accounting Pronouncements (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) aircraft
New Accounting Pronouncements or Change in Accounting Principle |  |
Aircraft under operating lease | aircraft |  | 53
Net Present Value Aircraft Operating Leases |  | $ 1,000
Rapid Rewards Frequent Flier Liability |  | $ 64
Reclassification From Other Revenue Into Passenger Revenue Related to the Adoption of Topic 606 of the New Revenue Recognition Standard | $ 600 |
Minimum |  |
New Accounting Pronouncements or Change in Accounting Principle |  |
Estimated Impact |  | 20
Maximum |  |
New Accounting Pronouncements or Change in Accounting Principle |  |
Estimated Impact |  | 25
B-717-200 |  |
New Accounting Pronouncements or Change in Accounting Principle |  |
Aircraft under operating lease | aircraft |  | 76

X
- Definition EstimatedImpact + References No definition available. + Details
Name: | luv_EstimatedImpact
Namespace Prefix: | luv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net Present Value Aircraft Operating Leases + References No definition available. + Details
Name: | luv_NetPresentValueAircraftOperatingLeases
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition RapidRewardsFrequentFlierLiability2 + References No definition available. + Details
Name: | luv_RapidRewardsFrequentFlierLiability2
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reclassification From Other Revenue Into Passenger Revenue Related to the Adoption of Topic 606 of the New Revenue Recognition Standard + References No definition available. + Details
Name: | luv_ReclassificationFromOtherRevenueIntoPassengerRevenue
Namespace Prefix: | luv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of units (items of property) under operating lease arrangements. + References No definition available. + Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AircraftTypeAxis=us-gaap_B717200Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |