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Long-term Debt, Short-term Borrowings, and Capital Lease Obligations (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
aircraft
Dec. 31, 2018
USD ($)
aircraft
Dec. 31, 2017
USD ($)
Nov. 12, 2019
USD ($)
aircraft
Mar. 30, 2014
USD ($)
aircraft
Apr. 30, 2013
USD ($)
Debt Instrument [Line Items]            
Pledged Assets Not Separately Reported Flight Equipment $ 4,300,000,000          
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 341,000,000          
Long-term Debt, by Type Alternative [Abstract]            
Long-term Debt 2,245,000,000 $ 1,563,000,000        
Long-term Debt, Fair Value $ 2,367,000,000 $ 1,577,000,000        
Long-term debt and capital lease obligations and the weighted average interest rate            
Finance Lease, Weighted Average Discount Rate, Percent 4.75% 4.73%        
Total debt and capital lease obligations $ 2,352,000,000 $ 1,680,000,000        
Less: current maturities (344,000,000) (309,000,000)        
Debt Acquisition Cost (18,000,000) (10,000,000)        
Long-term debt and capital lease obligations 1,990,000,000 1,361,000,000        
Maturities of Long-term Debt [Abstract]            
Long-term Debt, Maturities, Repayments of Principal in Year Two 340,000,000          
Long-term Debt, Maturities, Repayments of Principal in Year Three 319,000,000          
Long-term Debt, Maturities, Repayments of Principal in Year Four 298,000,000          
Long-term Debt, Maturities, Repayments of Principal in Year Five 169,000,000          
Long-term Debt, Maturities, Repayments of Principal after Year Five 867,000,000          
Finance Lease, Right-of-Use Asset 171,000,000 181,000,000        
Finance Lease Right Of Use Asset Accumulated Amortization 80,000,000 72,000,000        
Finance Lease, Liability, Payments, Due Next Twelve Months 35,000,000          
Finance Lease, Liability, Payments, Due Year Two 39,000,000          
Finance Lease, Liability, Payments, Due Year Three 9,000,000          
Finance Lease, Liability, Payments, Due Year Four 9,000,000          
Finance Lease, Liability, Payments, Due Year Five 5,000,000          
Finance Lease, Liability, Undiscounted Excess Amount 8,000,000          
Finance Lease, Liability 89,000,000 107,000,000        
Finance Lease, Liability, Current 31,000,000 18,000,000        
Finance Lease, Liability, Noncurrent 58,000,000 89,000,000        
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 62,000,000 59,000,000 $ 60,000,000      
Finance Lease, Liability, Payments, Due after Year Five $ 0          
Floating rate equipment notes due through 2028 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 120,000,000        
Long-term debt and capital lease obligations and the weighted average interest rate            
Weighted average interest rate 4.30% 4.90%        
Secured Debt $ 201,000,000 $ 247,000,000        
Fixed rate enhanced equipment notes, due through 2023 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount       $ 772,000,000 $ 226,000,000  
Debt Instrument, Interest Rate, Stated Percentage       2.75%    
Long-term debt and capital lease obligations and the weighted average interest rate            
Weighted average interest rate 4.50% 4.50%        
Secured Debt $ 134,000,000 $ 152,000,000        
Fixed rate enhanced equipment notes, due through 2032 [Member]            
Long-term Debt, by Type Alternative [Abstract]            
Long-term Debt 581,000,000 0        
Long-term Debt, Fair Value $ 586,000,000 $ 0        
Long-term debt and capital lease obligations and the weighted average interest rate            
Weighted average interest rate 2.80% 0.00%        
Secured Debt   $ 0   $ 589,000,000    
Fixed rate enhanced equipment notes, due through 2028 [Member]            
Long-term Debt, by Type Alternative [Abstract]            
Long-term Debt $ 181,000,000 0        
Long-term Debt, Fair Value $ 186,000,000 $ 0        
Long-term debt and capital lease obligations and the weighted average interest rate            
Weighted average interest rate 3.00% 0.00%        
Secured Debt   $ 0   $ 183,000,000    
Fixed rate equipment notes due through 2028 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 219,000,000 $ 567,000,000        
Debt Instrument, Interest Rate, Stated Percentage       2.95%    
Long-term debt and capital lease obligations and the weighted average interest rate            
Weighted average interest rate 4.20% 4.70%        
Secured Debt $ 1,113,000,000 $ 1,131,000,000        
Fixed rate specialty bonds, due through 2036 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount           $ 42,000,000
Long-term Debt, by Type Alternative [Abstract]            
Long-term Debt 42,000,000 42,000,000        
Long-term Debt, Fair Value $ 46,000,000 $ 44,000,000        
Long-term debt and capital lease obligations and the weighted average interest rate            
Weighted average interest rate 4.90% 4.90%        
Secured Debt $ 43,000,000 $ 43,000,000        
Maturities of Long-term Debt [Abstract]            
Debt Instrument, Net Amount           43,000,000
Debt Instrument, Unamortized Premium           $ 1,000,000
Capital Lease Obligations [Member]            
Long-term debt and capital lease obligations and the weighted average interest rate            
Finance Lease, Weighted Average Discount Rate, Percent 4.80% 4.70%        
Non Public Debt Floating Rate Equipment Notes Due Through Two Thousand And Twenty Eight [Member]            
Long-term Debt, by Type Alternative [Abstract]            
Long-term Debt $ 201,000,000 $ 245,000,000        
Long-term Debt, Fair Value 207,000,000 245,000,000        
Non Public Debt Fixed Rate Equipment Notes Due Through Two Thousand Twenty Eight [Member]            
Long-term Debt, by Type Alternative [Abstract]            
Long-term Debt 1,107,000,000 1,125,000,000        
Long-term Debt, Fair Value 1,201,000,000 1,135,000,000        
Non Public Debt Fixed Rate Enhanced Equipment Notes Due Through Two Thousand And Twenty Three [Member]            
Long-term Debt, by Type Alternative [Abstract]            
Long-term Debt 133,000,000 151,000,000        
Long-term Debt, Fair Value $ 141,000,000 153,000,000        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Floating rate equipment notes due through 2028 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Description of Variable Rate Basis LIBOR, plus a margin          
Fixed rate enhanced equipment notes, due through 2023 [Member]            
Maturities of Long-term Debt [Abstract]            
Debt Instrument, Frequency of Periodic Payment semi-annually          
Morgan Stanley [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Current Borrowing Capacity $ 200,000,000          
Morgan Stanley [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Description of Variable Rate Basis LIBOR, plus a margin          
Revolving Credit Facility and Letter of Credit Facility [Member] | Morgan Stanley [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Long-term Line of Credit $ 0 0        
Revolving Credit Facility and Letter of Credit Facility [Member] | Citibank [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Long-term Line of Credit 0 $ 0        
Line of Credit Facility, Current Borrowing Capacity $ 550,000,000          
Revolving Credit Facility and Letter of Credit Facility [Member] | Citibank [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Description of Variable Rate Basis LIBOR, plus a margin          
A-320-200 [Member]            
Maturities of Long-term Debt [Abstract]            
Finance Lease, Number of Aircraft Leases | aircraft 4 4        
A-320-200 [Member] | Secured Debt [Member] | Fixed rate enhanced equipment notes, due through 2023 [Member]            
Maturities of Long-term Debt [Abstract]            
Number of New Aircraft Held As Security | aircraft         14  
A-321-200 [Member]            
Maturities of Long-term Debt [Abstract]            
Finance Lease, Number of Aircraft Leases | aircraft 2 2        
Aircraft [Domain]            
Maturities of Long-term Debt [Abstract]            
Finance Lease, Number of Aircraft Leases | aircraft 6          
Finance Lease, Right-of-Use Asset $ 250,000,000 $ 253,000,000        
Finance Lease, Liability, Payments, Due Next Twelve Months 35,000,000          
Finance Lease, Liability, Payments, Due Year Two 39,000,000          
Finance Lease, Liability, Payments, Due Year Three 9,000,000          
Finance Lease, Liability, Payments, Due Year Four 9,000,000          
Finance Lease, Liability, Payments, Due Year Five 5,000,000          
Finance Lease, Liability, Payments, Due after Year Five $ 0          
A-320 [Member] | Secured Debt [Member] | Floating rate equipment notes due through 2028 [Member]            
Maturities of Long-term Debt [Abstract]            
Number of New Aircraft Held As Security | aircraft   6        
A-320 [Member] | Secured Debt [Member] | Fixed rate equipment notes due through 2028 [Member]            
Maturities of Long-term Debt [Abstract]            
Number of New Aircraft Held As Security | aircraft 10 14        
A-321 [Member] | Secured Debt [Member] | Floating rate equipment notes due through 2028 [Member]            
Maturities of Long-term Debt [Abstract]            
Number of New Aircraft Held As Security | aircraft   1        
A-321 [Member] | Secured Debt [Member] | Fixed rate equipment notes due through 2028 [Member]            
Maturities of Long-term Debt [Abstract]            
Number of New Aircraft Held As Security | aircraft 2 10        
A-321 [Member] | Fixed rate enhanced equipment notes, due through 2023 [Member]            
Maturities of Long-term Debt [Abstract]            
Number of New Aircraft Held As Security | aircraft       25