Debt - 2020-1 EETC (Details) - Secured Debt	9 Months Ended
Sep. 30, 2020 USD ($)
Pass Through Certificates Series 2020-1
Debt Instrument [Line Items]
Debt instrument amount	$ 1,135,000,000
Pass Through Certificates 2020-1 Class AA
Debt Instrument [Line Items]
Debt instrument amount	$ 796,000,000
Fixed interest rate (percent)	2.00%
Issuance date	Mar. 31, 2020
Final maturity date	Jun. 30, 2028
Pass Through Certificates 2020-1 Class A
Debt Instrument [Line Items]
Debt instrument amount	$ 204,000,000
Fixed interest rate (percent)	2.50%
Issuance date	Mar. 31, 2020
Final maturity date	Jun. 30, 2028
Pass Through Certificates 2020-1 Class B
Debt Instrument [Line Items]
Debt instrument amount	$ 135,000,000
Fixed interest rate (percent)	8.00%
Issuance date	Apr. 30, 2020
Final maturity date	Jun. 30, 2027

Face (par) amount of debt instrument at time of issuance.

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