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Income Taxes - Schedule of Reconciliation Between Actual Income Tax Expense and Amount Computed by Applying Statutory Tax Rate (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Effective Tax Rate [Line Items]
Statutory tax rate in Mexico	30.00%	30.00%	30.00%
Difference tax component between books and tax foreign exchange fluctuations	$ 12	$ (81)	$ (115)
Parent [member]
Reconciliation of Effective Tax Rate [Line Items]
Difference tax component between books and tax foreign exchange fluctuations	$ 312	$ 117
Mexico [member]
Reconciliation of Effective Tax Rate [Line Items]
Statutory tax rate in Mexico	30.00%	30.00%	30.00%

X

- Definition

Reconciliation of effective tax rate.

+ References

No definition available.

+ Details

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- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2020-01-01

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X

- Definition

The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to foreign tax rates. [Refer: Accounting profit]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph c
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_i&doctype=Standard
-URIDate 2020-01-01

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