Employee Benefit Plans - Changes in Fair Value Measurements of Level 3 Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Level 3
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	$ 17	$ 12
Relating to assets still held at the reporting date	10	1
Purchases	32	4
Sales	(1)	0
Fair value of plan assets at end of period	58	17
Pension Benefits
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	13,557	12,897
Fair value of plan assets at end of period	14,691	13,557
American Airlines, Inc. \| Level 3
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	17	12
Relating to assets still held at the reporting date	10	1
Purchases	32	4
Sales	(1)	0
Fair value of plan assets at end of period	58	17
American Airlines, Inc. \| Pension Benefits
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	13,477	12,829
Fair value of plan assets at end of period	$ 14,605	$ 13,477

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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- Definition

Amount, measured using unobservable input, of decrease in plan asset of defined benefit plan from sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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- Definition

Amount, measured using unobservable input, of increase in plan asset of defined benefit plan from purchase.

+ References

+ Details

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