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Long-term Debt, Short-term Borrowings and Finance Lease Obligations (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
May 08, 2020
Jun. 30, 2020
Apr. 23, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Long-term Debt   $ 3,711   $ 2,245
Reduction in outstanding debt and capital lease obligations   180    
Value of aircraft, engines and other equipment and facilities which were pledged as security under various loan agreements   6,300    
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year   177    
Long-term debt, maturities, repayments of principal in Year Two   1,400    
Long-term debt, maturities, repayments of principal in Year Three   348    
Long-term debt, maturities, repayments of principal in Year Four   878    
Long-term debt, maturities, repayments of principal in Year Five   897    
Long-term debt, maturities, repayments of principal after Year Five   1,100    
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   3,532   2,367
Public Debt Fixed Rate Special Facility Bonds Due Through Two Thousand Thirty Six [Member]        
Debt Instrument [Line Items]        
Long-term Debt   42   42
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   43   46
Fixed rate enhanced equipment notes, due through 2032 [Member]        
Debt Instrument [Line Items]        
Long-term Debt   574   581
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   419   586
Fixed rate enhanced equipment notes, due through 2028 [Member]        
Debt Instrument [Line Items]        
Long-term Debt   179   181
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   147   186
Non Public Debt Fixed Rate Enhanced Equipment Notes Due Through Two Thousand And Twenty Three [Member]        
Debt Instrument [Line Items]        
Long-term Debt   125   133
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   125   141
Non Public Debt Floating Rate Equipment Notes Due Through Two Thousand And Twenty Eight [Member]        
Debt Instrument [Line Items]        
Long-term Debt   176   201
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   162   207
Non Public Debt Fixed Rate Equipment Notes Due Through Two Thousand Twenty Eight [Member]        
Debt Instrument [Line Items]        
Long-term Debt   984   1,107
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   1,001   1,201
Non Public Debt Floating Rate Term Loan Credit Facility Due Through 2024 [Member]        
Debt Instrument [Line Items]        
Long-term Debt   717   0
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   764   0
Non Public Debt Unsecured CARES Act Payroll Support Program loan due through 2025 [Member]        
Debt Instrument [Line Items]        
Long-term Debt   251   0
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   217   0
Non Public Debt Sale Leaseback Transactions due through 2024 [Member]        
Debt Instrument [Line Items]        
Long-term Debt   117   0
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   134   0
Non Public Debt Citibank Line of Credit due through 2023 [Member]        
Debt Instrument [Line Items]        
Long-term Debt   546   0
Carrying amounts and estimated fair values of long-term debt        
Estimated Fair Value, Total   520   0
Barclays [Member] | Non Public Debt Floating Rate Term Loan Credit Facility Due Through 2024 [Member] | Long-term Debt [Member]        
Carrying amounts and estimated fair values of long-term debt        
Debt Instrument, Face Amount   750    
US Department of Treasury [Member] | Unsecured Debt [Member]        
Carrying amounts and estimated fair values of long-term debt        
Debt Instrument, Face Amount   251    
Debt Instrument, Interest Rate, Stated Percentage     1.00%  
Long-term Debt, Term     10 years  
Citibank [Member] | Non Public Debt Citibank Line of Credit due through 2023 [Member] | Line of Credit [Member]        
Carrying amounts and estimated fair values of long-term debt        
Line of Credit, Current   550    
Morgan Stanley [Member]        
Carrying amounts and estimated fair values of long-term debt        
Line of Credit, Current   $ 0   $ 0
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | US Department of Treasury [Member] | Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 2.00%      
London Interbank Offered Rate (LIBOR) [Member] | Barclays [Member] | Non Public Debt Floating Rate Term Loan Credit Facility Due Through 2024 [Member] | Long-term Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Description of Variable Rate Basis   LIBOR (subject to a 1.00% floor), or at our election another rate, in each case, plus a specified margin    
Carrying amounts and estimated fair values of long-term debt        
Debt Instrument, Interest Rate, Stated Percentage   6.25%    
London Interbank Offered Rate (LIBOR) [Member] | Citibank [Member] | Non Public Debt Citibank Line of Credit due through 2023 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Description of Variable Rate Basis   LIBOR, plus a margin    
Carrying amounts and estimated fair values of long-term debt        
Line of Credit Facility, Interest Rate During Period   2.99%    
Short-term Debt [Member] | Morgan Stanley [Member]        
Debt Instrument [Line Items]        
Short-term Debt, Fair Value   $ 997    
Debt Issuance Costs, Net   13    
Carrying amounts and estimated fair values of long-term debt        
Debt Instrument, Face Amount   $ 1,000    
Short-term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Morgan Stanley [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Description of Variable Rate Basis   LIBOR (but not less than 1% per annum), plus a margin    
Short-term Debt, Weighted Average Interest Rate, at Point in Time   2.75%    
Line of Credit [Member] | Morgan Stanley [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 200    
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Morgan Stanley [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Description of Variable Rate Basis   LIBOR, plus a margin