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Supplemental Financial Information - Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accrued Liabilities, Current [Abstract]    
Retirement plans $ 222 $ 135
Aircraft rentals 130 139
Vacation pay 281 270
Health 61 70
Workers compensation 156 159
Accrued taxes 119 67
Other 202 212
Accrued liabilities 1,207 1,102
Fuel derivatives | Accrued Liabilities
   
Accrued Liabilities, Current [Abstract]    
Liability derivative contracts, net $ 36 $ 50