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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Supplemental Financial Data [Line Items] |  |  |  |
Profitsharing and savings plans |  | $ 645 |  | $ 655
Aircraft and other lease related obligations |  | 55 |  | 74
Vacation pay |  | 355 |  | 309
Union Bonuses |  | 188 | [1] | 329
Health |  | 96 |  | 86
Workers compensation |  | 183 |  | 187
Property and income taxes |  | 68 |  | 62
Other |  | 237 |  | 246
Accrued liabilities |  | 1,985 |  | 2,591
Fuel derivatives | Accrued Liabilities |  |  |  |
Supplemental Financial Data [Line Items] |  |  |  |
Derivative contracts | [2] | $ 158 |  | $ 643
[1] | The decrease was due to collective-bargaining agreements reached with multiple workgroups during 2016 resulting in the payout of previously accrued bonuses. The remaining liability includes estimated bonuses that would be paid to union members upon ratification of collective-bargaining agreements for the various union contract groups that were in ongoing negotiations at December 31, 2016, coupled with the accrual of bonuses related to the collective-bargaining agreement reached with the Company's Flight Attendants that were paid in January 2017. The liability excludes certain immaterial benefit costs that are included as a component of Accounts payable. The amount accrued related to ongoing negotiations with various union contract groups 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 Consolidated Balance Sheet in Note 5.

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