Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Jun. 30, 2012	Dec. 31, 2010	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Expected total LFMP cost	$ 519
Municipal Bonds Issued		146	310
Airport construction obligation	$ 359			$ 331

The aggregate costs related to Love Field Modernization Project construction activities and recorded as an asset with a corresponding obligation.

No definition available.

Name:	luv_TotalRecordedLfmpConstructionCosts
Namespace Prefix:	luv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant