XML 65 R30.htm IDEA: XBRL DOCUMENT
v3.8.0.1

SPECIAL ITEMS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Unusual or Infrequent Items, or Both [Abstract] |
Merger-related Costs [Table Text Block] | The following breaks down merger-related costs incurred in 2017 and 2016 (in millions):
| 2017 |  | 2016
Consulting and professional services | $ | 52 |  |  | $ | 32 |
Severance and retention benefits | 40 |  |  | 22 |
Banking fees | — |  |  | 36 |
Legal and accounting fees | 3 |  |  | 22 |
Other merger-related costs(a) | 23 |  |  | 5 |
Total Merger-related Costs | $ | 118 |  |  | $ | 117 |
(a) | Other merger-related costs consist primarily of costs for marketing and advertising, IT, training and skill development, employee appreciation and company sponsored events, moving expenses, supplies, and other immaterial expenses.

X
- Definition [Table Text Block] for Merger-related Costs [Table] + References No definition available. + Details
Name: | alk_MergerrelatedCostsTableTextBlock
Namespace Prefix: | alk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ExtraordinaryAndUnusualItemsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration