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Financial Derivative Instruments - Location and Amount Recognized in Income by Hedging Relationship (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Cash Flow Hedging |  |
Derivative [Line Items] |  |
Amount of (gain) reclassified from AOCI into income | $ 127 | $ (658)
Cash Flow Hedging | Fuel derivative contracts |  |
Derivative [Line Items] |  |
Amount of (gain) reclassified from AOCI into income | 125 | (654)
Cash Flow Hedging | Interest rate derivative contracts |  |
Derivative [Line Items] |  |
Amount of (gain) reclassified from AOCI into income | 2 | (4)
Fuel and oil |  |
Derivative [Line Items] |  |
Derivatives designated as hedging instruments | (28) | (203)
Fuel and oil | Cash Flow Hedging | Fuel derivative contracts |  |
Derivative [Line Items] |  |
Amount of (gain) reclassified from AOCI into income | (28) | (203)
Fuel and oil | Cash Flow Hedging | Interest rate derivative contracts |  |
Derivative [Line Items] |  |
Amount of (gain) reclassified from AOCI into income | 0 | 0
Other operating expenses |  |
Derivative [Line Items] |  |
Derivatives designated as hedging instruments | 2 | 2
Other operating expenses | Cash Flow Hedging | Fuel derivative contracts |  |
Derivative [Line Items] |  |
Amount of (gain) reclassified from AOCI into income | 0 | 0
Other operating expenses | Cash Flow Hedging | Interest rate derivative contracts |  |
Derivative [Line Items] |  |
Amount of (gain) reclassified from AOCI into income | $ 2 | $ 2

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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 https://asc.fasb.org/extlink&oid=126968391&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 https://asc.fasb.org/extlink&oid=126968391&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 https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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