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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - LEASE RETURN PROVISION (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Lease Return Provision, Current	$ (112)	$ (186)
Lease Return Provision, Non-Current		$ (91)

X

- Definition

Lease Return Provision, Current

+ References

No definition available.

+ Details

Name:	alk_LeaseReturnProvisionCurrent
Namespace Prefix:	alk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Lease Return Provision, Non-Current

+ References

No definition available.

+ Details

Name:	alk_LeaseReturnProvisionNonCurrent
Namespace Prefix:	alk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration