Valuation and Qualifying Accounts - Components of Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for obsolescence of spare parts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 769	$ 765	$ 728
Additions Charged to Statement of Operations Accounts	70	29	37
Deductions	(25)	(25)	0
Balance at End of Year	814	769	765
Allowance for uncollectible accounts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	24	36	41
Additions Charged to Statement of Operations Accounts	42	43	47
Deductions	(37)	(55)	(52)
Balance at End of Year	29	24	36
American Airlines, Inc. [Member] | Allowance for obsolescence of spare parts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	717	720	689
Additions Charged to Statement of Operations Accounts	57	18	28
Deductions	(20)	(21)	3
Balance at End of Year	754	717	720
American Airlines, Inc. [Member] | Allowance for uncollectible accounts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	21	35	37
Additions Charged to Statement of Operations Accounts	39	41	47
Deductions	(36)	(55)	(49)
Balance at End of Year	$ 24	$ 21	$ 35