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COVID-19 PANDEMIC NARRATIVE (Details) | 12 Months Ended | 60 Months Ended |  |  |  |
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Dec. 31, 2020 USD ($) aircraft shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 22, 2030 | Feb. 05, 2021 USD ($) | Jan. 15, 2021 USD ($) shares | Dec. 24, 2020 $ / shares | Apr. 23, 2020 $ / shares
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Number of Mainline Aircraft Parked | aircraft | 32 |  |  |  |  |  |  |
Asset Impairment Charges | $ 363,000,000 |  |  |  |  |  |  |
Leased Aircraft Return Costs | 209,000,000 |  |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived | 10 |  |  |  |  |  |  |
Restructuring Charges | 220,000,000 | $ 0 | $ 0 |  |  |  |  |
Restructuring Reserve | 127,000,000 |  |  |  |  |  |  |
Aircraft Purchase Deposit, Write-off | 15,000,000 |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Writeoff | 5,000,000 |  |  |  |  |  |  |
Special Items - Impairment charges and other | 627,000,000 | 0 | $ 0 |  |  |  |  |
Total Expected Relief from PSP of CARES Act | 1,100,000,000 |  |  |  |  |  |  |
Unsecured Term Loan through PSP of CARES Act | 290,000,000 | $ 0 |  |  |  |  |  |
Line of credit facility, borrowing capacity | 461,000,000 |  |  |  |  |  |  |
Proceeds from Lines of Credit | 400,000,000 |  |  |  |  |  |  |
CARES Act Payroll Tax Relief | 29,000,000 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued | 14,000,000 |  |  |  |  |  |  |
Proceeds From Payroll Support Program Grant | $ 753,000,000 |  |  |  |  |  |  |
Airbus |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Aircraft Permanently Parked | aircraft | 40 |  |  |  |  |  |  |
Asset Impairment Charges | $ 302,000,000 |  |  |  |  |  |  |
Q400 |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Asset Impairment Charges | 61,000,000 |  |  |  |  |  |  |
ALK Common Stock Warrant |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  | $ 52.25 | $ 31.61
Subsequent Event |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Unsecured Term Loan through PSP of CARES Act |  |  |  |  | $ 130,000,000 | $ 51,000,000 |  |
Total Relief from Extension of PSP |  |  |  |  |  | $ 546,000,000 |  |
Subsequent Event | ALK Common Stock Warrant |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  |  |  |  | 101,227 |  |
Subsequent Event | Alaska Airlines and Horizon Air |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
PSP Installments Received |  |  |  |  |  | $ 266,000,000 |  |
Subsequent Event | McGee Air Services |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
PSP Installments Received |  |  |  |  | $ 6,000,000 |  |  |
CARES Act PSP Term Loan |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued | 8,000,000 |  |  |  |  |  |  |
US Treasury CARES Act Loan |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, borrowing capacity | 1,900,000,000 |  |  |  |  |  |  |
Proceeds from Lines of Credit | $ 135,000,000 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares | 427,080 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued | $ 6,000,000 |  |  |  |  |  |  |
CARES Act Unsecured Interest Rate |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.00% |  |  |  |  |  |  |
CARES Act Unsecured Interest Rate | Subsequent Event |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.00% |  |  |  |

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