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Income and Social Contribution Taxes - Summary of Changes in Deferred Income and Social Contribution Taxes (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of deferred income and social contribution taxes [Abstract]
Beginning balance	R$ 1,215	R$ 809	R$ 635
Effects allocated to Statement of income	(198)	141	(12)
Effects allocated to Statement of comprehensive income	133	265	191
Realized			(5)
Variations in deferred tax assets and liabilities	(14)
Ending balance	R$ 1,136	R$ 1,215	R$ 809

X

- Definition

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

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X

- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

+ References

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X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

+ References

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- Definition

The increase (decrease) in a deferred tax liability (asset). [Refer: Deferred tax liability (asset)]

+ References

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Disclosure of deferred income and social contribution taxes.

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