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Financial Derivative Instruments - Location and Amount Recognized in Income by Hedging Relationship (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Cash Flow Hedging
Derivative [Line Items]
Amount of (gain) loss reclassified from AOCI into income	$ (352)	$ 129	$ 452	$ 407
Cash Flow Hedging | Fuel derivative contracts
Derivative [Line Items]
Amount of (gain) loss reclassified from AOCI into income	(354)	128	438	402
Cash Flow Hedging | Interest rate derivative contracts
Derivative [Line Items]
Amount of (gain) loss reclassified from AOCI into income	2	1	14	5
Fuel and oil
Derivative [Line Items]
Derivatives designated as hedging instruments	(195)	2	(703)	30
Fuel and oil | Cash Flow Hedging | Fuel derivative contracts
Derivative [Line Items]
Amount of (gain) loss reclassified from AOCI into income	(195)	2	(703)	30
Fuel and oil | Cash Flow Hedging | Interest rate derivative contracts
Derivative [Line Items]
Amount of (gain) loss reclassified from AOCI into income	0	0	0	0
Other (gains)/losses, net
Derivative [Line Items]
Derivatives designated as hedging instruments			0	6
Other (gains)/losses, net | Cash Flow Hedging | Fuel derivative contracts
Derivative [Line Items]
Amount of (gain) loss reclassified from AOCI into income			0	6
Other (gains)/losses, net | Cash Flow Hedging | Interest rate derivative contracts
Derivative [Line Items]
Amount of (gain) loss reclassified from AOCI into income			0	0
Other operating expenses
Derivative [Line Items]
Derivatives designated as hedging instruments	2	1	5	4
Other operating expenses | Cash Flow Hedging | Fuel derivative contracts
Derivative [Line Items]
Amount of (gain) loss reclassified from AOCI into income	0	0	0	0
Other operating expenses | Cash Flow Hedging | Interest rate derivative contracts
Derivative [Line Items]
Amount of (gain) loss reclassified from AOCI into income	$ 2	$ 1	$ 5	$ 4

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
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-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
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-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

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