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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of deferred income and social contribution taxes [abstract]
Beginning balance	R$ 1,136	R$ 1,215	R$ 809
Effects allocated to Statement of income	(16)	(198)	141
Effect allocated to Statement of comprehensive income			265
Re-measurement of defined-benefit plan obligations	239
Net loss (gain) on actuarial restatement		133
Effects allocated to Equity	0
First-time adoption of IFRS 9 - effects allocated to equity (Note 2.5)	51
Reversal of deemed cost	18
Transfer to assets held for sale	(3)
Variations in deferred tax assets and liabilities	(3)	(14)
Deferred taxes arising from business combination	(3)
Ending balance	R$ 1,419	R$ 1,136	R$ 1,215

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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- Definition

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

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

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- 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 amount of income tax relating to an entity's share of other comprehensive income of associates and joint ventures accounted for using the equity method. [Refer: Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax]

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

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Disclosure of deferred income and social contribution taxes.

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IFRS adjustments for first time adoption.

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Reversal of deemed cost.

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Transfer of Assets Held For Sale.

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