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Financial Derivative Instruments - (Gain) Loss by Hedging Relationship (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in AOCI on derivatives, net of tax | $ (129) | $ 14 | $ (407) | $ 121
Cash Flow Hedging | Fuel derivative contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in AOCI on derivatives, net of tax | (128) | 17 | (402) | 91
Cash Flow Hedging | Interest rate derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in AOCI on derivatives, net of tax | (1) | (3) | (5) | 30
Not Designated as Hedging Instrument | Other Nonoperating Income (Expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in income on derivatives | 3 | 0 | (13) | 30
Not Designated as Hedging Instrument | Fuel derivative contracts | Other Nonoperating Income (Expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in income on derivatives | 3 | 1 | (13) | 2
Not Designated as Hedging Instrument | Interest rate derivatives | Other Nonoperating Income (Expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Gain) loss recognized in income on derivatives | $ 0 | $ (1) | $ 0 | $ 28

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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=125515794&loc=SL5618551-113959 + Details
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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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