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FINANCIAL RISK MANAGEMENT (Details) - Schedule of sensitivity analysis - Fuel options [Member] - Fuel-Price Risk [Member] - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Top of range [member]
FINANCIAL RISK MANAGEMENT (Details) - Schedule of sensitivity analysis [Line Items]
Benchmark price (in Dollars per share)	$ 5
Positions effect on equity	$ 15.4	$ 7.4
Bottom of range [member]
FINANCIAL RISK MANAGEMENT (Details) - Schedule of sensitivity analysis [Line Items]
Benchmark price (in Dollars per share)	$ (5)
Positions effect on equity	$ (34.5)	$ (5.5)

X

- Definition

It represents the benchmark price percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	ltm_
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Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

It represents the amount of positions effect on equity.

+ References

No definition available.

+ Details

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

X

- Details

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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: