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Special Items - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2017
USD ($)
Technician
Mar. 31, 2016
USD ($)
Special Charges [Line Items]    
Severance and benefits costs $ 37,000,000 $ 8,000,000
Severance and benefits costs net of tax   5,000,000
Labor agreement costs   $ 100,000,000
Lease maturity year   2029
Cleveland airport lease restructuring   $ 74,000,000
Cleveland airport lease restructuring, net of taxes   47,000,000
(Gains) losses on sale of assets and other special charges 14,000,000 8,000,000
(Gains) losses on sale of assets and other special charges, net of tax 9,000,000 5,000,000
Venezuela local currency loss   8,000,000
Venezuela local currency loss, net of tax   5,000,000
Accrual severance and benefit $ 28,000,000 29,000,000
Severance-related accrual expected payment date 2017  
Accrual for permanently grounded aircraft $ 40,000,000 49,000,000
Grounded aircraft related accrual expected payment date 2025  
International Brotherhood of Teamsters    
Special Charges [Line Items]    
Severance and benefits costs $ 21,000,000  
Severance and benefits costs net of tax $ 14,000,000  
Int'l Association of Machinists    
Special Charges [Line Items]    
Labor agreement costs   100,000,000
Labor agreement costs net of tax   $ 64,000,000
Voluntary early out program | International Brotherhood of Teamsters    
Special Charges [Line Items]    
Number of positions eliminated | Technician 1,000  
Voluntary early out program | International Brotherhood of Teamsters | Maximum    
Special Charges [Line Items]    
Severance payment per participant $ 100,000  
Management Reorganization Initiative    
Special Charges [Line Items]    
Severance and benefits costs 16,000,000  
Severance and benefits costs net of tax $ 10,000,000