Special Charges - Additional Information (Detail)	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) Contract	Mar. 31, 2016 USD ($) Contract	Mar. 31, 2015 USD ($)	Dec. 31, 2014 Attendant	Dec. 31, 2015 USD ($)
Special Charges [Line Items]
Labor agreement costs		$ 100,000,000
Charge related to the amended lease		$ 74,000,000
Lease maturity year		2029
Severance and benefits costs		$ 8,000,000	$ 50,000,000
Severance and benefits costs net of tax		5,000,000
Venezuela local currency loss		8,000,000	6,000,000
Other charges			5,000,000
Gain on sale of asset			9,000,000
Integration-related costs			18,000,000
Intangible assets	$ 4,112,000,000	4,112,000,000			$ 4,136,000,000
Accrual severance and benefit	29,000,000	$ 29,000,000	$ 96,000,000
Severance-related accrual expected payment date		2016
Newark Liberty International Airport
Special Charges [Line Items]
Intangible assets	$ 412,000,000	$ 412,000,000
Lease Amendment Charges
Special Charges [Line Items]
Charge related to the amended lease		74,000,000
Charge related to the amended lease net of tax		47,000,000
Voluntary early out program
Special Charges [Line Items]
Number of positions eliminated | Attendant				2,500
Voluntary early out program | Maximum
Special Charges [Line Items]
Severance payment per participant					$ 100,000
Int'1 Association of Machinists
Special Charges [Line Items]
Labor agreement costs		100,000,000
Labor agreement costs net of tax		$ 64,000,000
Number of new contracts extended | Contract	7	7
Service contract extended year	2021	2021