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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Accrued Liabilities, Current [Abstract]
ProfitSharing and savings plans		$ 798	$ 655
Aircraft and other lease related obligations		50	74
Vacation pay		314	309
Accrued union bonuses		244	329
Health		80	86
Workers compensation		191	187
Property and income taxes		232	62
Other		205	246
Accrued liabilities		2,472	2,591
Fuel derivatives | Accrued Liabilities
Accrued Liabilities, Current [Abstract]
Derivative contracts	[1]	$ 358	$ 643
[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.

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Net fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected to be offset against a right to receive collateral.

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Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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