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Supplemental Financial Information (Tables) | 9 Months Ended
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Sep. 30, 2018
Table Text Block [Abstract] |
Other Assets |
(in millions) | September 30, 2018 |  | December 31, 2017
Derivative contracts | $ | 333 |  |  | $ | 136 |
Intangible assets, net | 403 |  |  | 413 |
Capital lease receivable | 65 |  |  | 76 |
Non-current prepaid maintenance | 57 |  |  | 5 |
Other | 174 |  |  | 156 |
Other assets | $ | 1,032 |  |  | $ | 786 |
Schedule of Accounts Payable |
(in millions) | September 30, 2018 |  | December 31, 2017
Accounts payable trade | $ | 266 |  |  | $ | 186 |
Salaries payable | 183 |  |  | 201 |
Taxes payable | 196 |  |  | 203 |
Aircraft maintenance payable | 65 |  |  | 38 |
Fuel payable | 108 |  |  | 123 |
Other payables | 406 |  |  | 569 |
Accounts payable | $ | 1,224 |  |  | $ | 1,320 |
Accrued Liabilities |
(in millions) | September 30, 2018 |  | December 31, 2017
ProfitSharing and savings plans | $ | 432 |  |  | $ | 579 |
Aircraft and other lease related obligations | 38 |  |  | 40 |
Permanently grounded aircraft liability (a) | — |  |  | 34 |
Vacation pay | 392 |  |  | 365 |
Health | 96 |  |  | 100 |
Workers compensation | 166 |  |  | 172 |
Property and income taxes | 61 |  |  | 57 |
Other | 332 |  |  | 353 |
Accrued liabilities | $ | 1,517 |  |  | $ | 1,700 |
Other Noncurrent Liabilities |
(in millions) | September 30, 2018 |  | December 31, 2017
Postretirement obligation | $ | 294 |  |  | $ | 275 |
Non-current lease-related obligations | 56 |  |  | 85 |
Permanently grounded aircraft liability (a) | — |  |  | 13 |
Other deferred compensation | 260 |  |  | 237 |
Derivative contracts | 22 |  |  | 21 |
Other | 116 |  |  | 76 |
Other noncurrent liabilities | $ | 748 |  |  | $ | 707 |
(a) 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

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