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Supplemental Financial Information - Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accrued Liabilities, Current [Abstract]    
Profitsharing and savings plans $ 268 $ 244
Aircraft and other lease related obligations 152 173
Vacation pay 291 278
Health 70 73
Workers compensation 160 161
Property and other taxes 50 62
Other 255 226
Accrued liabilities 1,277 1,229
Fuel derivatives | Accrued Liabilities
    
Accrued Liabilities, Current [Abstract]    
Liability derivative contracts, net $ 31 [1] $ 12 [1]
[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 5.