Employee Benefit Plans - Changes in Fair Value Measurements of Level 3 Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Level 3
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	$ 58	$ 17
Relating to assets still held at the reporting date	1	10
Purchases	29	32
Sales	(9)	(1)
Transfers out	(4)	0
Fair value of plan assets at end of period	75	58
Pension Benefits
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	14,691	13,557
Fair value of plan assets at end of period	11,884	14,691
American Airlines, Inc. \| Level 3
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	58	17
Relating to assets still held at the reporting date	1	10
Purchases	29	32
Sales	(9)	(1)
Transfers out	(4)	0
Fair value of plan assets at end of period	75	58
American Airlines, Inc. \| Pension Benefits
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	14,605	13,477
Fair value of plan assets at end of period	$ 11,821	$ 14,605

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
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Section 55
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-URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

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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
-Paragraph 1
-Subparagraph (d)(iv)(02)(B)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

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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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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

+ References

+ Details

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- Details

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