Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Income tax provision	$ 87	$ 195
Alternative Minimum Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Alternative minimum tax credit carryforwards			$ 339
Alternative Minimum Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Change in deferred tax assets valuation allowance	22
Federal [Member]
Income Taxes [Line Items]
Gross NOL Carryforwards			10,000
State [Member]
Income Taxes [Line Items]
Gross NOL Carryforwards			3,400
American Airlines, Inc. [Member]
Income Taxes [Line Items]
Income tax provision	113	$ 212
American Airlines, Inc. [Member] | Alternative Minimum Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Alternative minimum tax credit carryforwards			452
American Airlines, Inc. [Member] | Alternative Minimum Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Change in deferred tax assets valuation allowance	$ 30
American Airlines, Inc. [Member] | Federal [Member]
Income Taxes [Line Items]
Gross NOL Carryforwards			10,600
American Airlines, Inc. [Member] | State [Member]
Income Taxes [Line Items]
Gross NOL Carryforwards			$ 3,200