ASSETS CONSTRUCTED FOR OTHERS (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Sale Leaseback Transaction [Line Items]
Other property and equipment	$ 178alk_OtherPropertyAndEquipment
Other Liabilities	$ 174us-gaap_OtherLiabilities

The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_OtherLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant