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EMPLOYEE BENEFITS (Details) - Schedule of principal assumptions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Defined Benefit Plans Abstract
Discount rate	3.13%	4.27%
Expected rate of salary increase	4.50%	4.50%
Rate of turnover	6.04%	6.60%
Mortality rate	RV-2014	RV-2014
Inflation rate	2.80%	2.70%
Retirement age of women	60	60
Retirement age of men	65	65

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard
-URIDate 2019-03-27

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X

- Definition

The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard
-URIDate 2019-03-27

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X

- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard
-URIDate 2019-03-27

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X

- References

No definition available.

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Namespace Prefix:	ifrs-full_
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X

- Definition

It represents the actuarial assumption of rate of turnover.

+ References

No definition available.

+ Details

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Namespace Prefix:	ltm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Description about the mortality rate.

+ References

No definition available.

+ Details

Name:	ltm_MortalityRate
Namespace Prefix:	ltm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

It represents the retirement age of men.

+ References

No definition available.

+ Details

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Namespace Prefix:	ltm_
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Balance Type:	na
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X

- Definition

It represents the retirement age of women.

+ References

No definition available.

+ Details

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Namespace Prefix:	ltm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration