Employee Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) for plan amendment				$ (1,900,000,000)
Amortization period of gains losses related to plan amendment				8 years
Unamortized actuarial gain	$ 390,000,000
Weighted average expected rate of return on plan assets	8.00%
Estimated future employer contributions for next fiscal year	$ 786,000,000
Defined benefit plans estimated supplemental future employer contributions in next fiscal year	21,000,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
The estimated actuarial gain (loss) and prior service benefit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ (181,000,000)
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
The estimated actuarial gain (loss) and prior service benefit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ 269,000,000
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) for plan amendment				$ (1,900,000,000)
Amortization period of gains losses related to plan amendment				8 years
Unamortized actuarial gain	$ 390,000,000
Estimated future employer contributions for next fiscal year	780,000,000
Defined benefit plans estimated supplemental future employer contributions in next fiscal year	21,000,000
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
The estimated actuarial gain (loss) and prior service benefit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ (181,000,000)
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
The estimated actuarial gain (loss) and prior service benefit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ 269,000,000
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%