Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2010	Dec. 31, 2015
Airport Project [Line Items]
Assets constructed for others	$ 986		$ 915
Construction obligation	825		$ 757
Fort Lauderdale-Hollywood International Airport
Airport Project [Line Items]
Total Expected Cost Of Airport Project	295
Assets constructed for others	40
HOU
Airport Project [Line Items]
Total Expected Cost Of Airport Project	156
Assets constructed for others	147
Los Angeles World Airport
Airport Project [Line Items]
Total Expected Cost Of Airport Project	526
Assets constructed for others	240
Construction obligation	240
DAL
Airport Project [Line Items]
Assets constructed for others	538
Municipal bonds issued		$ 456
Municipal bonds principal remaining	439
Construction obligation	524
DAL Garage
Airport Project [Line Items]
Assets constructed for others	27
Construction obligation	$ 27