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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018		Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]
Postretirement obligation	$ 282		$ 275
Non-current lease-related obligations	75		85
Permanently grounded aircraft liability noncurrent	13	[1]	13
Other deferred compensation	241		237
Other	71		76
Other noncurrent liabilities	706		707
Other Noncurrent Liabilities
Other Liabilities, Noncurrent [Abstract]
Derivative contracts	$ 24		$ 21
[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 first quarter 2018 decrease was primarily related to contractual rent obligations paid.

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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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This element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition and for incentives for sublease transaction of aircraft.

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Permanently grounded aircraft liability noncurrent

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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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