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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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- Definition 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. + References No definition available. + Details
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