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COSTS AND EXPENSES BY NATURE (Details) - Schedule of finance costs - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of finance costs [Abstract]
Bank loan interest	$ 314,468	$ 325,650	$ 283,786
Financial leases	45,245	61,980	62,202
Lease liabilities	170,918	181,814	182,868
Other financial instruments	56,348	20,490	10,281
Total	$ 586,979	$ 589,934	$ 539,137

X

- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_g&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of costs associated with financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 82
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_b&doctype=Standard
-URIDate 2020-01-01

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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of costs associated with bank loan interest activities of the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	ltm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Lease Liabilities Cost

+ References

No definition available.

+ Details

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Namespace Prefix:	ltm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of costs associated with other financial instruments activities of the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	ltm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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