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Financial Derivative Instruments Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Derivative [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage |  | 15.00% |
Premiums paid for fuel derivative contracts |  | $ 35 | $ 26
Current Unrealized Net Gains (Losses) in OCI |  | (547) |
Maximum sum of derivatives of counterparty to be included in other (less than $20 million) |  | $ 5 |
Maximum cash collateral provided as a percentage of derivative contract value (in hundredths) |  | 100.00% |
Maximum letter of credit percent of collateral |  | 100.00% |
Cash Flow Hedging |  |  |
Derivative [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [1] | $ (197) | (48)
Cash Flow Hedging | Fuel derivatives |  |  |
Derivative [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [1],[2] | (195) | (45)
Cash Flow Hedging | Interest rate derivatives |  |  |
Derivative [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | [1],[2] | $ (2) | $ (3)
Remainder of Current Year |  |  |
Derivative [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Percent of Required Need, Coverage |  | 60.00% |
[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 the percentage of cash collateral that can be provided with a letter of credit. + 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=56946850&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=56946850&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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