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Business Combinations and Asset Acquisitions (Details) $ / shares in Units, $ in Billions	Dec. 02, 2023 USD ($) $ / shares
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business Acquisition, Amount Per Share Paid To Each Holder of Record | $ / shares	$ 18.00
Business Acquisition , Amount Paid To Each Holder Of Record | $	$ 1

X

- Definition

Business Acquisition , Amount Paid To Each Holder Of Record

+ References

No definition available.

+ Details

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

X

- Definition

Business Acquisition, Amount Per Share Paid To Each Holder of Record

+ References

No definition available.

+ Details

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Namespace Prefix:	alk_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

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