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Long-term Debt (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Mortgages
aircraft
Debt Instrument [Line Items]  
Letters of Credit Outstanding Amount $ 148,000,000
Line of Credit Facility, Interest Rate at Period End 100.00%
Net book value of assets pledged as collateral for the Company's secured borrowings, primarily aircraft and engines $ 990,000,000
Net book value of additional assets pledged as collateral in case obligations related to fuel derivatives exceed certain thresholds 1,200,000,000
Long-term Debt, by Maturity [Abstract]  
2020 819,000,000
2021 170,000,000
2022 475,000,000
2023 103,000,000
2024 103,000,000
Thereafter 990,000,000
AirTran Airways | Interest rate derivatives  
Debt Instrument [Line Items]  
Notional amount $ 13,000,000
AirTran Airways | Maximum | Interest rate derivatives  
Debt Instrument [Line Items]  
Interest rate stated in the debt agreement (in hundredths) 4.50%
2.75% Unsecured Senior Notes Due November 2019  
Debt Instrument [Line Items]  
Face amount of debt $ 300,000,000
Interest rate stated in the debt agreement (in hundredths) 2.75%
Term Loan Agreement payable through May 2019 - 6.315%  
Debt Instrument [Line Items]  
Number of mortgages on secured aircraft | Mortgages 14
Interest rate stated in the debt agreement (in hundredths) 6.315%
Term Loan Agreement payable through May 2019 - 6.315% | LIBOR  
Debt Instrument [Line Items]  
Spread on variable rate 3.30%
Term Loan Agreement payable through May 2019 - 6.315% | Maximum  
Debt Instrument [Line Items]  
Face amount of debt $ 332,000,000
Term Loan Agreement payable through July 2019 - 4.84%  
Debt Instrument [Line Items]  
Number of mortgages on secured aircraft | Mortgages 5
Interest rate stated in the debt agreement (in hundredths) 4.84%
Term Loan Agreement payable through July 2019 - 4.84% | Maximum  
Debt Instrument [Line Items]  
Face amount of debt $ 124,000,000
2.65% Notes due 2020  
Debt Instrument [Line Items]  
Face amount of debt $ 500,000,000
Interest rate stated in the debt agreement (in hundredths) 2.65%
Term Loan Agreement payable through 2020 - 5.223%  
Debt Instrument [Line Items]  
Number of mortgages on secured aircraft | Mortgages 21
Face amount of debt $ 600,000,000
Interest rate stated in the debt agreement (in hundredths) 5.223%
Term Loan Agreement payable through 2020 - 5.223% | LIBOR  
Debt Instrument [Line Items]  
Spread on variable rate 0.95%
737 Aircraft Notes payable through 2020 | AirTran Airways  
Debt Instrument [Line Items]  
Number of mortgages on secured aircraft | aircraft 3
Weighted average interest rate 3.49%
Unsecured Senior Notes Due 2022 - 2.75%  
Debt Instrument [Line Items]  
Face amount of debt $ 300,000,000
Interest rate stated in the debt agreement (in hundredths) 2.75%
Pass Through Certificates due 2022 - 6.24%  
Debt Instrument [Line Items]  
Number of mortgages on secured aircraft | Mortgages 16
Face amount of debt $ 500,000,000
Pass Through Certificates due 2022 - 6.24% | Interest rate derivatives | Cash Flow Hedging  
Debt Instrument [Line Items]  
Notional amount 20,000,000
Pass Through Certificates Series A  
Debt Instrument [Line Items]  
Face amount of debt $ 412,000,000
Interest rate stated in the debt agreement (in hundredths) 6.15%
Pass Through Certificates Series B  
Debt Instrument [Line Items]  
Face amount of debt $ 88,000,000
Interest rate stated in the debt agreement (in hundredths) 6.65%
Term Loan Agreement Due 2026 - 3.03%  
Debt Instrument [Line Items]  
Number of mortgages on secured aircraft | Mortgages 7
Interest rate stated in the debt agreement (in hundredths) 3.03%
Term Loan Agreement Due 2026 - 3.03% | LIBOR  
Debt Instrument [Line Items]  
Spread on variable rate 1.10%
Term Loan Agreement Due 2026 - 3.03% | Maximum  
Debt Instrument [Line Items]  
Face amount of debt $ 215,000,000
Unsecured Senior Notes Due 2026 - 3.00%  
Debt Instrument [Line Items]  
Face amount of debt $ 300,000,000
Interest rate stated in the debt agreement (in hundredths) 3.00%
Unsecured Senior Notes Due 2027 - 3.45%  
Debt Instrument [Line Items]  
Face amount of debt $ 300,000,000
Interest rate stated in the debt agreement (in hundredths) 3.45%
Unsecured Senior Notes Due 2027 - 3.45% | Treasury Rate  
Debt Instrument [Line Items]  
Spread on variable rate 20.00%
7.375% Debentures due 2027  
Debt Instrument [Line Items]  
Face amount of debt $ 100,000,000
Interest rate stated in the debt agreement (in hundredths) 7.375%
Enhanced Equipment Trust Certificate | Pass Through Certificates due 2022 - 6.24%  
Debt Instrument [Line Items]  
Interest rate stated in the debt agreement (in hundredths) 6.24%
B-737-700  
Debt Instrument [Line Items]  
Maximum additional number of assets pledged as collateral in case obligations related to fuel derivatives exceed certain thresholds | aircraft 12
B-737-800  
Debt Instrument [Line Items]  
Maximum additional number of assets pledged as collateral in case obligations related to fuel derivatives exceed certain thresholds | aircraft 37
Revolving Credit Facility [Member]  
Debt Instrument [Line Items]  
Line of Credit Facility, Current Borrowing Capacity $ 1,000,000,000.0
Line of Credit Facility, Maximum Borrowing Capacity 1,500,000,000
Line of Credit Facility, Fair Value of Amount Outstanding $ 0