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Supplemental Financial Information - Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accrued Liabilities, Current [Abstract]    
Profitsharing and savings plans $ 267 $ 244
Aircraft and other lease related obligations 109 173
Vacation pay 282 278
Health 71 73
Workers compensation 162 161
Accrued taxes 60 65
Other 217 223
Accrued liabilities 1,168 1,229
Fuel derivatives | Accrued Liabilities
   
Accrued Liabilities, Current [Abstract]    
Liability derivative contracts, net $ 0 [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.