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Financial Instruments - Class of Assets and Liabilities Subject to Recurring Fair Value Measurements Categorized Within Level 3 (Details)	12 Months Ended
	Dec. 31, 2020
Non-recurring basis
Financial Instruments
Expected future cash flow time period	5 years

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Definition

The expected period for calculation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	tv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Details

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