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LEASES - Future Lease Payment under Terms of Capacity Purchase Agreement (Details) $ in Millions	Dec. 31, 2024 USD ($)
Leases [Abstract]
2025	$ 453
2026	320
2027	610
2028	283
2029	280
After 2029	3,232
Total	5,178
Imputed interest	(1,466)
Less: current maturities of lease obligations	(257)
Other financial liabilities	$ 3,455

X

- Definition

Contractual Obligation, Imputed Interest

+ References

No definition available.

+ Details

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Namespace Prefix:	ual_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Other Financial Liabilities, Current

+ References

No definition available.

+ Details

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Namespace Prefix:	ual_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Other Financial Liabilities, Noncurrent

+ References

No definition available.

+ Details

Name:	ual_OtherFinancialLiabilitiesNoncurrent
Namespace Prefix:	ual_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

+ Details

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X

- Definition

Amount of contractual obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

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- References

No definition available.

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