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Financial Derivative Instruments Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Feb. 10, 2015 | Dec. 31, 2006
Derivative [Line Items] |  |  |  |  |  |  |
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge |  |  |  |  |  | $ 12,000,000 |
Premiums paid for fuel derivative contracts |  | $ 22,000,000 | $ 17,000,000 | $ 48,000,000 | $ 34,000,000 |  |
Current Unrealized Net Gains (Losses) in OCI |  | (323,000,000) |  | (323,000,000) |  |  |
Maximum sum of derivatives of counterparty to be included in other (less than $20 million) |  | $ 10,000,000 |  | $ 10,000,000 |  |  |
Cash collateral provided as a percentage of derivative contract value (in hundredths) |  | 100.00% |  | 100.00% |  |  |
Letter of Credit Percent of Collateral |  | 100.00% |  | 100.00% |  |  |
5.75% Notes due 2016 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 300,000,000
Stated interest rate |  |  |  |  |  |  | 5.75%
Fuel derivatives |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
GainLossOnDerivativeNetDueToLossOfHedgeAccounting |  | $ 7,000,000 |  | $ 4,000,000 |  |  |
Cash Flow Hedging |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [1] | (44,000,000) | (2,000,000) | (93,000,000) | (6,000,000) |  |
Cash Flow Hedging | Fuel derivatives |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [1],[2] | (41,000,000) | 1,000,000 | (87,000,000) | 1,000,000 |  |
Cash Flow Hedging | Interest rate derivatives |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [1],[2] | $ (3,000,000) | $ (3,000,000) | $ (6,000,000) | $ (7,000,000) |  |
Remainder of 2015 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage |  | 89.00% |  | 89.00% |  |  |
[1] | Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.
[2] | Net of tax

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