Income Taxes - Additional Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Income tax provision	$ 570	$ 472	$ 2,113
Income tax expense, effective rate	25.00%
Impact of the 2017 Tax Act	$ 0	0	823
Alternative Minimum Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Alternative minimum tax credit carryforwards	170
Federal [Member]
Income Taxes [Line Items]
Gross NOL carryforwards	9,100
Federal NOL carryforwards, maximum allowable utilization	9,000
Federal NOL carryforwards, remaining amount	7,300
State [Member]
Income Taxes [Line Items]
Gross NOL carryforwards	3,000
American Airlines, Inc. [Member]
Income Taxes [Line Items]
Income tax provision	$ 633	534	2,270
Income tax expense, effective rate	24.00%
Impact of the 2017 Tax Act	$ 0	$ 0	$ 924
American Airlines, Inc. [Member] | Alternative Minimum Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Alternative minimum tax credit carryforwards	226
American Airlines, Inc. [Member] | Federal [Member]
Income Taxes [Line Items]
Gross NOL carryforwards	9,200
Federal NOL carryforwards, maximum allowable utilization	9,500
Federal NOL carryforwards, remaining amount	7,200
American Airlines, Inc. [Member] | State [Member]
Income Taxes [Line Items]
Gross NOL carryforwards	$ 2,900