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WORLDWIDE PANDEMIC - Narrative (Details) $ / shares in Units, $ in Millions					3 Months Ended		12 Months Ended	24 Months Ended
	Apr. 23, 2026	Jan. 15, 2026	Apr. 20, 2025	Jun. 01, 2020	Dec. 31, 2021 USD ($) employee aircraft $ / shares	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) employee aircraft $ / shares	Dec. 31, 2021 employee aircraft $ / shares
COVID - 19
Unusual or Infrequent Item, or Both [Line Items]
Voluntary separation program 2020 participants					4,200		4,200	4,200
Number of employees who participated in extended emergency time off during 2020							11,400	12,000
Total employees who participated in extended emergency time off During 2020, who were still on emergency time off at December 31, 2020					250		250	250
Number of days before the end of their term				90 days
Employees who elected conversion in extended emergency time off							360
Extended emergency time off accrual for employees who accepted through 2020 | $					$ 328	$ 1,400	$ 446
Extended emergency time off reversal for employees who accepted through March 31, 2021 | $							140
Proceeds from PSP2 payroll support program | $							$ 2,700
Aircrafts in long-term storage | aircraft					6		6	6
COVID - 19 | Minimum
Unusual or Infrequent Item, or Both [Line Items]
Extended emergency time off, period				6 months
COVID - 19 | Minimum | Option to Convert to Voluntary Separation Program 2020
Unusual or Infrequent Item, or Both [Line Items]
Extended emergency time off, period				12 months
Years of service				10 years
COVID - 19 | Maximum
Unusual or Infrequent Item, or Both [Line Items]
Extended emergency time off, period				18 months
COVID - 19 | Maximum | Option to Convert to Voluntary Separation Program 2020
Unusual or Infrequent Item, or Both [Line Items]
Extended emergency time off, period				18 months
COVID - 19 | Maximum | Pilots
Unusual or Infrequent Item, or Both [Line Items]
Extended emergency time off, period				5 years
United States Department of Treasury | PSP1 Payroll Support Program
Unusual or Infrequent Item, or Both [Line Items]
Strike price (in USD per share) | $ / shares					$ 36.47		$ 36.47	$ 36.47
United States Department of Treasury | PSP1 Payroll Support Program | Notes Payable, Other Payables
Unusual or Infrequent Item, or Both [Line Items]
Interest rate stated in the debt agreement (as a percent)					1.00%		1.00%	1.00%
United States Department of Treasury | PSP1 Payroll Support Program | Notes Payable, Other Payables | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Forecast
Unusual or Infrequent Item, or Both [Line Items]
Spread on variable rate (as a percent)			2.00%
United States Department of Treasury | PSP2 Payroll Support Program
Unusual or Infrequent Item, or Both [Line Items]
Strike price (in USD per share) | $ / shares					$ 46.28		$ 46.28	$ 46.28
Expiration period (in years)							5 years
United States Department of Treasury | PSP2 Payroll Support Program | Notes Payable, Other Payables
Unusual or Infrequent Item, or Both [Line Items]
Interest rate stated in the debt agreement (as a percent)					1.00%		1.00%	1.00%
United States Department of Treasury | PSP2 Payroll Support Program | Notes Payable, Other Payables | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Forecast
Unusual or Infrequent Item, or Both [Line Items]
Spread on variable rate (as a percent)		2.00%
United States Department of Treasury | PSP3 Payroll Support Program
Unusual or Infrequent Item, or Both [Line Items]
Strike price (in USD per share) | $ / shares					$ 58.51		$ 58.51	$ 58.51
Expiration period (in years)							5 years
United States Department of Treasury | PSP3 Payroll Support Program | Notes Payable, Other Payables
Unusual or Infrequent Item, or Both [Line Items]
Interest rate stated in the debt agreement (as a percent)					1.00%		1.00%	1.00%
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Unusual or Infrequent Item, or Both [Line Items]
Spread on variable rate (as a percent)	2.00%

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