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Debt - Details of Pass Through Trusts (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 01, 2021	Feb. 28, 2021
Debt Instrument [Line Items]
Proceeds received from issuance of debt	$ 16,044,000,000	$ 1,847,000,000	$ 1,594,000,000
Total debt recorded	27,301,000,000	$ 14,733,000,000
Pass-Through Certificates
Debt Instrument [Line Items]
Proceeds received from issuance of debt	3,328,000,000
Total debt recorded	4,221,000,000
Pass-Through Certificates | Subsequent Event
Debt Instrument [Line Items]
Principal				$ 4,821,000,000
Class AA EETC - Issued September 2019 | Pass-Through Certificates
Debt Instrument [Line Items]
Principal	$ 702,000,000
Stated interest rate	2.70%
Proceeds received from issuance of debt	$ 189,000,000
Total debt recorded	702,000,000
Class A EETC - Issued September 2019 | Pass-Through Certificates
Debt Instrument [Line Items]
Principal	$ 287,000,000
Stated interest rate	2.90%
Proceeds received from issuance of debt	$ 77,000,000
Total debt recorded	287,000,000
Class B EETC - Issued September 2019 | Pass-Through Certificates
Debt Instrument [Line Items]
Principal	$ 232,000,000
Stated interest rate	3.50%
Proceeds received from issuance of debt	$ 62,000,000
Total debt recorded	232,000,000
Class A EETC - Issued October 2020 | Pass-Through Certificates
Debt Instrument [Line Items]
Principal	$ 3,000,000,000
Stated interest rate	5.88%
Proceeds received from issuance of debt	$ 3,000,000,000
Total debt recorded	$ 3,000,000,000
Class B EETC - Issued February 2021 | Pass-Through Certificates
Debt Instrument [Line Items]
Stated interest rate	4.88%
Total debt recorded	$ 0
Class B EETC - Issued February 2021 | Pass-Through Certificates | Subsequent Event
Debt Instrument [Line Items]
Principal					$ 600,000,000

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

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

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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