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NON-CURRENT ASSETS AND DISPOSAL GROUP CLASSIFIED AS HELD FOR SALE (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
NON-CURRENT ASSETS AND DISPOSAL GROUP CLASSIFIED AS HELD FOR SALE (Details) [Line Items]
Assets reclassified from inventories net realizable value	$ 2,000
Assets reclassified from property, plant and equipment net realizable value	62,000
Income statement to adjust the assets to its fair value less the cost of sales	332,000
Boeing 767 [Member]
NON-CURRENT ASSETS AND DISPOSAL GROUP CLASSIFIED AS HELD FOR SALE (Details) [Line Items]
Profit from the transaction	$ 5,500

X

- Definition

The aggregate difference between the fair value at initial recognition and the transaction price for financial instruments that is yet to be recognised in profit or loss. [Refer: Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 28
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_28_b&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

It repesent by assets reclassified from inventories net realizable value.

+ References

No definition available.

+ Details

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

X

- Definition

It repesent by assets reclassified from property plant and equipment net relizable value.

+ References

No definition available.

+ Details

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

X

- Definition

Income statement to adjust the assets to its fair value less the cost of sales.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: