XML 106 R32.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions [Table Text Block] | Future minimum payments for commitments as of December 31, 2019 (in millions):
|  | Aircraft Commitments(a) |  | Capacity Purchase Agreements(b) |  | Aircraft Maintenance Deposits
2020 |  | $ | 531 |  |  | $ | 145 |  |  | $ | 73 |
2021 |  | 487 |  |  | 166 |  |  | 62 |
2022 |  | 347 |  |  | 174 |  |  | 51 |
2023 |  | 206 |  |  | 179 |  |  | 26 |
2024 |  | 31 |  |  | 184 |  |  | 6 |
Thereafter |  | 26 |  |  | 880 |  |  | 2 |
Total |  | $ | 1,628 |  |  | $ | 1,728 |  |  | $ | 220 |

X
- Definition Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions [Table Text Block] + References No definition available. + Details
Name: | alk_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesAndUnrecordedUnconditionalPurchaseObligationsTableTextBlock
Namespace Prefix: | alk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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