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LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (DETAILS) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]      
Long-term Debt $ 803us-gaap_LongTermDebt $ 871us-gaap_LongTermDebt  
Less current portion 117us-gaap_LongTermDebtCurrent 117us-gaap_LongTermDebtCurrent  
Long-term debt, net of current portion 686us-gaap_LongTermDebtNoncurrent 754us-gaap_LongTermDebtNoncurrent  
Weighted-average variable-interest rate 5.70%us-gaap_LongTermDebtPercentageBearingFixedInterestRate 5.70%us-gaap_LongTermDebtPercentageBearingFixedInterestRate  
Weighted-average variable-interest rate 1.60%us-gaap_LongTermDebtPercentageBearingVariableInterestRate 1.70%us-gaap_LongTermDebtPercentageBearingVariableInterestRate  
Proceeds from Issuance of Debt 51us-gaap_ProceedsFromIssuanceOfDebt 0us-gaap_ProceedsFromIssuanceOfDebt 0us-gaap_ProceedsFromIssuanceOfDebt
Long-term Debt, Fiscal Year Maturity [Abstract]      
2015 117us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths    
2016 115us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo    
2017 121us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree    
2018 151us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour    
2019 114us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive    
Thereafter 185us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive    
Long-term Debt 803us-gaap_LongTermDebt 871us-gaap_LongTermDebt  
Fixed-rate notes payable due through 2024      
Debt Instrument [Line Items]      
Long-term Debt 614us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= alk_FixedRateNotesPayableDueThrough2024Member
703us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= alk_FixedRateNotesPayableDueThrough2024Member
 
Long-term Debt, Fiscal Year Maturity [Abstract]      
Long-term Debt 614us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= alk_FixedRateNotesPayableDueThrough2024Member
703us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= alk_FixedRateNotesPayableDueThrough2024Member
 
Variable-rate notes payable due through 2025      
Debt Instrument [Line Items]      
Long-term Debt 189us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= alk_VariableRateNotesPayableDueThrough2024Member
168us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= alk_VariableRateNotesPayableDueThrough2024Member
 
Long-term Debt, Fiscal Year Maturity [Abstract]      
Long-term Debt 189us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= alk_VariableRateNotesPayableDueThrough2024Member
168us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= alk_VariableRateNotesPayableDueThrough2024Member
 
Scheduled debt payments [Member]      
Debt Instrument [Line Items]      
Debt payments $ 119us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= alk_ScheduledDebtPaymentsMember