Airport Redevelopment - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) concourse terminal_gate	Dec. 31, 2016 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2010 USD ($)
Agreements and Obligations [Line Items]
Special project bonds face amount					$ 800
Financial Guarantee | Revolving Credit Facility
Agreements and Obligations [Line Items]
Aggregate commitments guaranteed				$ 800
ASU No. 2016-02
Agreements and Obligations [Line Items]
Derecognition of construction assets and liabilities and increase to equity upon adoption			$ 40
JFK International Air Terminal LLC
Agreements and Obligations [Line Items]
Lease agreement, term					33 years
JFK Airport Redevelopment
Agreements and Obligations [Line Items]
Construction in progress, gross				691
Construction obligation				744
LAX Redevelopment Project
Agreements and Obligations [Line Items]
Initial investment in project		$ 350
Expected additional costs for expansion project	$ 1,500
Additional costs for expansion that have been approved	1,300
Amount spent on project costs	208
LaGuardia Airport Redevelopment Project
Agreements and Obligations [Line Items]
Amount spent on project costs	$ 304
Number of new gates in redeveloped terminal | terminal_gate	37
Number of new concourses in redeveloped terminal | concourse	4
Increase in concessions space (percent)	30.00%
Port Authority contribution to redevelopment project				$ 600
Expected net projects costs	$ 3,300