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Financial Derivative Instruments Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Fuel derivatives | Sep. 30, 2014 Fuel derivatives | Sep. 30, 2014 Cash Flow Hedging | Sep. 30, 2013 Cash Flow Hedging | Sep. 30, 2014 Cash Flow Hedging | Sep. 30, 2013 Cash Flow Hedging | Sep. 30, 2014 Cash Flow Hedging Fuel derivatives | Sep. 30, 2013 Cash Flow Hedging Fuel derivatives | Sep. 30, 2014 Cash Flow Hedging Fuel derivatives | Sep. 30, 2013 Cash Flow Hedging Fuel derivatives | Sep. 30, 2014 Cash Flow Hedging Interest rate derivatives | Sep. 30, 2013 Cash Flow Hedging Interest rate derivatives | Sep. 30, 2014 Cash Flow Hedging Interest rate derivatives | Sep. 30, 2013 Cash Flow Hedging Interest rate derivatives | Sep. 30, 2014 Remainder of 2014 | Sep. 30, 2014 Other Noncurrent Liabilities Interest rate derivatives | Dec. 31, 2013 Other Noncurrent Liabilities Interest rate derivatives
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage | 62.00% |  | 62.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31.00% |  |
GainLossOnDerivativeNetDueToLossOfHedgeAccounting |  |  |  |  | $ 12 | $ 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sublease Rollforward |  |  |
(in millions) |  | B717 lease/sublease liability
Balance at December 31, 2012 |  | $ | 128 |
Lease/sublease accretion |  | 6 |
Lease/sublease payments, net (a) |  | (12 | )
Balance at December 31, 2013 |  | $ | 122 |
Lease/sublease accretion |  | 4 |
Lease/sublease expense adjustment |  | 19 |
Lease/sublease payments, net (a) |  | (66 | )
Balance at September 30, 2014 |  | $ | 79 |
(a) Includes lease conversion cost payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash collateral deposits provided to counterparty - noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 | 32
Premiums paid for fuel derivative contracts | 15 | 22 | 49 | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Unrealized Net Gains (Losses) in OCI | (72) |  | (72) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  |  |  |  |  | (8) | [1] | (28) | [1] | (13) | [1] | (102) | [1] | (4) | [1],[2] | (24) | [1],[2] | (3) | [1],[2] | (88) | [1],[2] | (4) | [1],[2] | (4) | [1],[2] | (10) | [1],[2] | (14) | [1],[2] |  |  |
Maximum sum of derivatives of counterparty to be included in other (less than $20 million) | $ 10 |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash collateral provided as a percentage of derivative contract value (in hundredths) | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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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- Definition Represents percentage of cash collateral provided on the fair value of fuel derivative contracts when credit rating is non-investment grade. + References No definition available. + Details
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- Definition Total cash that is already posted, at the end of the reporting period, as noncurrent collateral for derivative instruments with credit-risk-related contingent features. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement due to loss of hedge accounting treatment. + References No definition available. + Details
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- Definition Maximum sum of derivatives of a counterparty to be included in Other and no risk of the Company posting collateral. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959 + Details
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- Definition The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need. + References No definition available. + Details
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- Definition The net gain (loss) relating to components of the gain (loss) on price risk fair value hedging instruments excluded from the assessment of fair value hedge effectiveness. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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