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Taxes - Demonstration of Income Tax and Social Contribution Expense (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Major components of tax expense (income) [abstract]      
Net income before income tax and social contribution R$ 31,243 R$ 30,608 R$ 30,582
Charges (income tax and social contribution) at the rates in effect (12,497) (13,774) (13,762)
Increase / decrease in income tax and social contribution charges arising from:      
Share of profit or (loss) of associates and joint ventures net 372 147 169
Foreign exchange variation on investments abroad 711 4,381 397
Interest on capital 3,012 3,791 3,873
Corporate reorganizations (Note 2.4 a IV)   628 628
Dividends and interest on external debt bonds 543 516 420
Other nondeductible expenses net of non taxable income [1] (1,233) 1,747 3,736
Income tax and social contribution expenses (9,092) (2,564) (4,539)
Related to temporary differences      
Increase (reversal) for the period 5,750 (2,650) (2,888)
Increase (reversal) of prior periods (88) 245 70
(Expenses) / Income related to deferred taxes 5,662 (2,405) (2,818)
Total income tax and social contribution expenses R$ (3,430) R$ (4,969) R$ (7,357)
[1] Includes temporary (additions) and exclusions.