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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fuel derivatives | Prepaid expenses and other current assets |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | $ 30 | $ 41
Gross liability amounts offset in the Balance Sheet |  | (28) | (26)
Asset derivative contracts, net | [1] | 2 | 15
Fuel derivatives | Other Assets |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | 45 | 7
Gross liability amounts offset in the Balance Sheet |  | (30) | 0
Asset derivative contracts, net | [1] | 15 | 7
Fuel derivatives | Accrued Liabilities |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | 1,580 | 1,737
Gross liability amounts offset in the Balance Sheet |  | (1,580) | (1,737)
Asset derivative contracts, net | [1] | 0 | 0
Fuel derivatives | Other Noncurrent Liabilities |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | 846 | 985
Gross liability amounts offset in the Balance Sheet |  | (846) | (985)
Asset derivative contracts, net | [1] | 0 | 0
Interest rate derivatives | Other Assets |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | 16 | 2
Gross liability amounts offset in the Balance Sheet |  | 0 | 0
Asset derivative contracts, net | [1] | $ 16 | $ 2
[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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