Basis of Presentation and Summary of Significant Accounting Policies - Significant Categories of Reported Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Total operating revenues	$ 11,313	$ 11,911	$ 11,960	$ 10,584	$ 10,938	$ 11,559	$ 11,643	$ 10,401	$ 45,768	$ 44,541	$ 42,622
Passenger [Member]
Revenue from External Customer [Line Items]
Total operating revenues									42,010	40,676	39,131
Passenger travel [Member]
Revenue from External Customer [Line Items]
Total operating revenues									38,831	37,457	36,152
Loyalty revenue - travel [Member]
Revenue from External Customer [Line Items]
Total operating revenues									3,179	3,219	2,979
Cargo [Member]
Revenue from External Customer [Line Items]
Total operating revenues									863	1,013	890
Other [Member]
Revenue from External Customer [Line Items]
Total operating revenues									2,895	2,852	2,601
Loyalty revenue - marketing services [Member]
Revenue from External Customer [Line Items]
Total operating revenues									2,361	2,352	2,124
Other revenue [Member]
Revenue from External Customer [Line Items]
Total operating revenues									534	500	477
American Airlines, Inc. [Member]
Revenue from External Customer [Line Items]
Total operating revenues	$ 11,312	$ 11,910	$ 11,958	$ 10,581	$ 10,936	$ 11,556	$ 11,640	$ 10,398	45,761	44,530	42,610
American Airlines, Inc. [Member] | Passenger [Member]
Revenue from External Customer [Line Items]
Total operating revenues									42,010	40,676	39,131
American Airlines, Inc. [Member] | Passenger travel [Member]
Revenue from External Customer [Line Items]
Total operating revenues									38,831	37,457	36,152
American Airlines, Inc. [Member] | Loyalty revenue - travel [Member]
Revenue from External Customer [Line Items]
Total operating revenues									3,179	3,219	2,979
American Airlines, Inc. [Member] | Cargo [Member]
Revenue from External Customer [Line Items]
Total operating revenues									863	1,013	890
American Airlines, Inc. [Member] | Other [Member]
Revenue from External Customer [Line Items]
Total operating revenues									2,888	2,841	2,589
American Airlines, Inc. [Member] | Loyalty revenue - marketing services [Member]
Revenue from External Customer [Line Items]
Total operating revenues									2,361	2,352	2,124
American Airlines, Inc. [Member] | Other revenue [Member]
Revenue from External Customer [Line Items]
Total operating revenues									$ 527	$ 489	$ 465