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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Accrued Liabilities, Current [Abstract]    
ProfitSharing and savings plans $ 517 $ 655
Aircraft and other lease related obligations 52 74
Vacation pay 339 309
Accrued union bonuses [1] 533 329
Health 90 86
Workers compensation 179 187
Property and income taxes 63 62
Other 219 246
Accrued liabilities 2,146 2,591
Fuel derivatives | Accrued Liabilities    
Accrued Liabilities, Current [Abstract]    
Derivative contracts [2] $ 154 $ 643
[1] As part of the ongoing negotiations with various union contract groups during 2016, the Company has recorded a liability for estimated bonuses that would be paid out to union members upon ratification of labor agreements. The liability excludes certain immaterial benefit costs that are included as a component of Accounts payable. The amount accrued is subject to change based on subsequent negotiations, and any changes would be recorded on a prospective basis.
[2] 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.