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Financial Derivative Instruments - Offsetting of Derivative Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Other Noncurrent Liabilities |  |  |
Offsetting Liabilities [Line Items] |  |  |
Liability derivative contracts, net |  | $ 17 | $ 74
Fuel derivatives | Prepaid expenses and other current assets |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 19 | 26
Gross asset amounts offset in the Balance Sheet |  | (19) | (26)
Liability derivative contracts, net | [1] | 0 | 0
Fuel derivatives | Other Assets |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 11 | 0
Gross asset amounts offset in the Balance Sheet |  | (11) | 0
Liability derivative contracts, net | [1] | 0 | 0
Fuel derivatives | Accrued Liabilities |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 1,222 | 2,380
Gross asset amounts offset in the Balance Sheet |  | (957) | (1,737)
Liability derivative contracts, net | [1] | 265 | 643
Fuel derivatives | Other Noncurrent Liabilities |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 494 | 1,010
Gross asset amounts offset in the Balance Sheet |  | (494) | (985)
Liability derivative contracts, net | [1] | 0 | 25
Interest rate derivatives | Other Noncurrent Liabilities |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 44 | 49
Gross asset amounts offset in the Balance Sheet |  | 0 | 0
Liability derivative contracts, net | [1] | $ 44 | $ 49
[1] | The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 5.

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