Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Supplemental Financial Information - Accounts Payable [Abstract]
Accounts payable trade	$ 170	$ 123
Salaries payable	340	160
Excise and other tax withholdings payable	157	163
Aircraft Maintenance Payable	162	314
Fuel Payable	46	85
Other payables	360	358
Accounts Payable, Current	$ 1,235	$ 1,203