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Financial Instruments - Hedging reserve Rollforward (Details) - MXN ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about hedged items [line items]
Taxes due to changes in reserves during the period	$ 992	$ 871	$ (391)
Hedging reserve
Disclosure of detailed information about hedged items [line items]
Balances at beginning of the period	1,580
Balances at the end of the period	4,121	$ 1,580
Hedging reserve | Foreign exchange currency risk | Purchase of stock
Disclosure of detailed information about hedged items [line items]
Fair value changes	77
Amounts included in non-financial costs	785
Hedging reserve | Foreign exchange currency risk | Other stock
Disclosure of detailed information about hedged items [line items]
Fair value changes	3,511
Amounts reclassified to profit an loss	(1,526)
Hedging reserve | Interest rate risk
Disclosure of detailed information about hedged items [line items]
Fair value changes	584
Amounts reclassified to profit an loss	(1)
Taxes due to changes in reserves during the period	(992)
Hedging reserve | Commodity price risk | Purchase of stock
Disclosure of detailed information about hedged items [line items]
Fair value changes	1,244
Amounts included in non-financial costs	$ (1,141)

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- Definition

The amounts removed from equity and included in the initial cost or other carrying amount of a non-financial asset (liability) whose acquisition or incurrence was a hedged, highly probable forecast transaction, net of tax. [Refer: Carrying amount [member]]

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The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax, before reclassification adjustments. [Refer: Cash flow hedges [member]]

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The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]

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A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]]

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