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Financial Derivative Instruments - (Gain) Loss by Hedging Relationship (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
(Gain) Loss recognized in AOCI on derivatives (effective portion) | $ 212 |  | $ (103) |  | $ 106 |  | $ 101 |
(Gain) Loss reclassified from AOCI into income (effective portion) | 8 | [1] | 28 | [1] | 13 | [1] | 102 | [1]
(Gain) Loss recognized in income on derivatives (ineffective portion) | 9 | [2] | 15 | [2] | (34) | [2] | 26 | [2]
Fuel derivatives | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
(Gain) Loss recognized in AOCI on derivatives (effective portion) | 214 | [3] | (105) | [3] | 104 | [3] | 113 | [3]
(Gain) Loss reclassified from AOCI into income (effective portion) | 4 | [1],[3] | 24 | [1],[3] | 3 | [1],[3] | 88 | [1],[3]
(Gain) Loss recognized in income on derivatives (ineffective portion) | 11 | [2] | 15 | [2] | (31) | [2] | 27 | [2]
Interest rate derivatives | Cash Flow Hedging |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
(Gain) Loss recognized in AOCI on derivatives (effective portion) | (2) | [3] | 2 | [3] | 2 | [3] | (12) | [3]
(Gain) Loss reclassified from AOCI into income (effective portion) | 4 | [1],[3] | 4 | [1],[3] | 10 | [1],[3] | 14 | [1],[3]
(Gain) Loss recognized in income on derivatives (ineffective portion) | (2) | [2] | 0 | [2] | (3) | [2] | (1) | [2]
Other Nonoperating Income Expense | Fuel derivatives | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
(Gain) loss recognized in income on derivatives | $ 39 |  | $ (93) |  | $ (1) |  | $ (122) |
[1] | Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.
[2] | Amounts are included in Other (gains) losses, net.
[3] | Net of tax

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + 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 effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss) from the ineffectiveness of the hedge. + 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 (d)(1) -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 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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