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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Accrued Liabilities, Current [Abstract]
ProfitSharing and savings plans		$ 299	$ 579
Aircraft and other lease related obligations		39	40
Permanently grounded aircraft liability current	[1]	5	34
Vacation pay		383	365
Union Bonuses		96	83
Health		97	100
Workers compensation		170	172
Property and income taxes		72	57
Other		200	270
Accrued liabilities		$ 1,361	$ 1,700
[1] These amounts represent the current and noncurrent portion of the Company's cease-use liability recorded as a result of the Company grounding its remaining leased Boeing 737-300 aircraft in 2017. The decrease was primarily related to contractual rent obligations paid.

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