Employee Benefit Plans - Schedule of Assumption Used to Determine Benefit Obligations (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net periodic benefit cost (income):
Weighted average expected rate of return on plan assets	8.00%
Pension Benefits
Benefit obligations:
Weighted average discount rate	2.70%	3.40%
Net periodic benefit cost (income):
Weighted average discount rate	3.40%	4.40%	3.80%
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
Retiree Medical and Other Postretirement Benefits
Benefit obligations:
Weighted average discount rate	2.40%	3.30%
Net periodic benefit cost (income):
Weighted average discount rate	3.20%	4.30%	3.60%
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
Weighted average health care cost trend rate assumed for next year	4.00%	3.70%	3.90%
Weighted average health care cost trend rate assumed for 2027 and thereafter	3.40%
American Airlines, Inc.
Net periodic benefit cost (income):
Weighted average expected rate of return on plan assets	8.00%
American Airlines, Inc. \| Pension Benefits
Benefit obligations:
Weighted average discount rate	2.70%	3.40%
Net periodic benefit cost (income):
Weighted average discount rate	3.40%	4.40%	3.80%
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
American Airlines, Inc. \| Retiree Medical and Other Postretirement Benefits
Benefit obligations:
Weighted average discount rate	2.40%	3.30%
Net periodic benefit cost (income):
Weighted average discount rate	3.20%	4.30%	3.60%
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
Weighted average health care cost trend rate assumed for next year	4.00%	3.70%	3.90%
Weighted average health care cost trend rate assumed for 2027 and thereafter	3.40%

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

+ Details

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920

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- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

+ References

+ Details

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

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