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Transactions with Related Parties (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Issuance of shares of AAG common stock pursuant to a public stock offering (in shares)	85,215,000	85,200,000
American Airlines, Inc.
Related Party Transaction [Line Items]
Receivables from related parties, net		$ 9,183	$ 12,451
Issuance of shares of AAG common stock pursuant to a public stock offering (in shares)		85,200,000
American Airlines, Inc. \| AAG [Member]
Related Party Transaction [Line Items]
Receivables from related parties, net		$ 11,212	14,597
American Airlines, Inc. \| AAG's wholly-owned subsidiaries [Member]
Related Party Transaction [Line Items]
Receivables from related parties, net		$ (2,029)	$ (2,146)
6.50% Senior Notes \| Unsecured Debt
Related Party Transaction [Line Items]
Fixed interest rate per annum		6.50%
6.50% Senior Notes \| Unsecured Debt \| American Airlines, Inc.
Related Party Transaction [Line Items]
Fixed interest rate per annum		6.50%