REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total passenger revenue	$ 63,364	$ 61,643	$ 58,048
Passenger
Disaggregation of Revenue [Line Items]
Total passenger revenue	51,768	50,894	48,909
Ticket
Disaggregation of Revenue [Line Items]
Total passenger revenue	45,488	45,096	43,596
Loyalty travel awards
Disaggregation of Revenue [Line Items]
Total passenger revenue	4,237	3,841	3,462
Travel-related services
Disaggregation of Revenue [Line Items]
Total passenger revenue	$ 2,043	$ 1,957	$ 1,851

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details