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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, 2018 | Dec. 31, 2017
Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
(Gain) loss recognized in AOCI on derivatives (effective portion) |  | $ 0 | $ 32
(Gain) loss recognized in income on derivatives (ineffective portion) | [1] | 0 | 32
Not Designated as Hedging Instrument | Other Nonoperating Income (Expense) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
(Gain) loss recognized in income on derivatives |  | (2) | 71
Fuel derivatives | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
(Gain) loss recognized in AOCI on derivatives (effective portion) | [2] | 1 | 32
(Gain) loss recognized in income on derivatives (ineffective portion) | [1] | 0 | 31
Fuel derivatives | Not Designated as Hedging Instrument | Other Nonoperating Income (Expense) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
(Gain) loss recognized in income on derivatives |  | 0 | 75
Interest rate derivatives | Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) |  |  |
(Gain) loss recognized in AOCI on derivatives (effective portion) | [2] | (1) | 0
(Gain) loss recognized in income on derivatives (ineffective portion) | [1] | 0 | 1
Interest rate derivatives | Not Designated as Hedging Instrument | Other Nonoperating Income (Expense) |  |  |
Derivative Instruments, Gain (Loss) |  |  |
(Gain) loss recognized in income on derivatives |  | $ (2) | $ (4)
[1] | Amounts are included in Other (gains) losses, net.
[2] | 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Amount of gain (loss) from the ineffectiveness of the hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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