Share Based Compensation - Restricted Stock Unit Awards (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Number of Shares [Roll Forward]
Number of Shares, Beginning Balance (in shares)	4,320	4,324	5,187
Number of Shares, Granted (in shares)	3,206	2,194	2,309
Number of Shares, Vested and released (in shares)	(2,002)	(1,999)	(2,708)
Number of Shares, Forfeited (in shares)	(337)	(199)	(464)
Number of Shares, Ending balance (in shares)	5,187	4,320	4,324
Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share)	$ 44.29	$ 46.94	$ 41.48
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	34.00	47.65	48.58
Weighted Average Grant Date Fair Value, Vested and released (in dollars per share)	44.90	44.99	39.63
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	42.55	45.72	44.48
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share)	$ 37.01	$ 44.29	$ 46.94
Unrecognized compensation cost	$ 108
Recognition period	1 year
Total fair value of stock-settled during the year	$ 68	$ 91	$ 123
American Airlines, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Number of Shares [Roll Forward]
Number of Shares, Beginning Balance (in shares)	4,320	4,324	5,187
Number of Shares, Granted (in shares)	3,206	2,194	2,309
Number of Shares, Vested and released (in shares)	(2,002)	(1,999)	(2,708)
Number of Shares, Forfeited (in shares)	(337)	(199)	(464)
Number of Shares, Ending balance (in shares)	5,187	4,320	4,324
Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share)	$ 44.29	$ 46.94	$ 41.48
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	34.00	47.65	48.58
Weighted Average Grant Date Fair Value, Vested and released (in dollars per share)	44.90	44.99	39.63
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	42.55	45.72	44.48
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share)	$ 37.01	$ 44.29	$ 46.94
Unrecognized compensation cost	$ 108
Recognition period	1 year
Total fair value of stock-settled during the year	$ 68	$ 91	$ 123

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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