Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2012	Dec. 31, 2010	Jun. 30, 2015	Dec. 31, 2014
Airport Project [Line Items]
Assets constructed for others			$ 745	$ 621
Construction obligation			632	$ 554
Fort Lauderdale-Hollywood International Airport
Airport Project [Line Items]
Total Expected Cost Of Airport Project			295
HOU
Airport Project [Line Items]
Total Expected Cost Of Airport Project			156
Assets constructed for others			106
Los Angeles World Airport
Airport Project [Line Items]
Total Expected Cost Of Airport Project			526
Assets constructed for others			110
Construction obligation			110
DAL
Airport Project [Line Items]
Assets constructed for others			521
Municipal bonds issued	$ 146	$ 310
Construction obligation			$ 515