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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Other Liabilities, Noncurrent [Abstract] |  |  |
Postretirement obligation | $ 274 |  | $ 256
Non-current lease-related obligations | 94 |  | 125
Permanently grounded aircraft liability noncurrent | 18 | [1] | 0
Other deferred compensation | 225 |  | 204
Other | 81 |  | 108
Other noncurrent liabilities | 713 |  | 728
Other Noncurrent Liabilities |  |  |
Other Liabilities, Noncurrent [Abstract] |  |  |
Derivative contracts | $ 21 |  | $ 35
[1] | These amounts represent the current and noncurrent portion of the Company's cease-use liability recorded during third quarter 2017, as a result of the Company grounding its remaining leased Boeing 737-300 aircraft on September 29, 2017.

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