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SPECIAL ITEMS SPECIAL ITEMS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Special items—merger-related costs and other $ 118 $ 117  
Special items—other     $ 32
Special tax expense (benefit) (280) 17 (26)
Nondeductible expenses 5 20 4
Pension Plan [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Settlement expense (special item) 0 0 $ 14
Virgin America Inc. [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Special items—merger-related costs and other $ 118 117  
Nondeductible expenses   $ 39