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Transactions with Related Parties (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 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. [Member]
Related Party Transaction [Line Items]
Receivables from related parties, net	$ 9,147	$ 9,147	$ 12,451
American Airlines, Inc. [Member] \| AAG [Member]
Related Party Transaction [Line Items]
Receivables from related parties, net	11,229	11,229	14,597
American Airlines, Inc. [Member] \| AAG's wholly-owned subsidiaries [Member]
Related Party Transaction [Line Items]
Receivables from related parties, net	$ (2,082)	$ (2,082)	$ (2,146)
6.50% Senior Notes [Member] \| Unsecured Debt [Member]
Related Party Transaction [Line Items]
Interest rate	6.50%	6.50%
6.50% Senior Notes [Member] \| Unsecured Debt [Member] \| American Airlines, Inc. [Member]
Related Party Transaction [Line Items]
Interest rate	6.50%	6.50%