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Financial Derivative Instruments - (Gain) Loss by Hedging Relationship (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
(Gain) loss recognized in AOCI on derivatives (effective portion) |  | $ 32 | $ (120)
(Gain) loss reclassified from AOCI into income (effective portion) | [1] | 356 | 622
(Gain) loss recognized in income on derivatives (ineffective portion) | [2] | 32 | (14)
Not Designated as Hedging Instrument | Other Nonoperating Income (Expense) |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
(Gain) loss recognized in income on derivatives |  | 71 | 12
Fuel derivatives | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
(Gain) loss recognized in AOCI on derivatives (effective portion) | [3] | 32 | (122)
(Gain) loss reclassified from AOCI into income (effective portion) | [1],[3] | 349 | 613
(Gain) loss recognized in income on derivatives (ineffective portion) | [2] | 31 | (11)
Fuel derivatives | Not Designated as Hedging Instrument | Other Nonoperating Income (Expense) |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
(Gain) loss recognized in income on derivatives |  | 75 | 14
Interest rate derivatives | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
(Gain) loss recognized in AOCI on derivatives (effective portion) | [3] | 0 | 2
(Gain) loss reclassified from AOCI into income (effective portion) | [1],[3] | 7 | 9
(Gain) loss recognized in income on derivatives (ineffective portion) | [2] | 1 | (3)
Interest rate derivatives | Not Designated as Hedging Instrument | Other Nonoperating Income (Expense) |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
(Gain) loss recognized in income on derivatives |  | $ (4) | $ (2)
[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=84234895&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=84234895&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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=84234895&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=84234895&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=84234895&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=84234895&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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