Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for obsolescence of spare parts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 784	$ 814	$ 769
Additions Charged to Statement of Operations Accounts	100	91	70
Deductions	(394)	(121)	(25)
Balance at End of Year	490	784	814
Allowance for credit losses on accounts receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	31	29	24
Additions Charged to Statement of Operations Accounts	27	19	42
Deductions	(22)	(17)	(37)
Balance at End of Year	36	31	29
American Airlines, Inc. | Allowance for obsolescence of spare parts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	729	754	717
Additions Charged to Statement of Operations Accounts	81	79	57
Deductions	(368)	(104)	(20)
Balance at End of Year	442	729	754
American Airlines, Inc. | Allowance for credit losses on accounts receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	25	24	21
Additions Charged to Statement of Operations Accounts	25	17	39
Deductions	(21)	(16)	(36)
Balance at End of Year	$ 29	$ 25	$ 24