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Stockholders' Equity - Schedule of Stockholders' Compensation (Detail) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [abstract]      
Dividends R$ 0.0150 R$ 150 R$ 150
Dividends 0.0150 150 150
Dividends provision 0.7869 0.6240 0.1304
Interest on capital   0.1252 3,990
Interest on capital 0.0376 0.0106 0.1445
Identified in Profit Reserve In Stockholders' Equity R$ 1.0067 R$ 1.8001 R$ 2.1126
Paid / prepaid, Gross R$ 9,274 R$ 5,921 R$ 3,666
Dividends-paid, Gross 7,668   1,074
Accrued (Recorded in Other Liabilities) 512 248 1,877
Interest on capital-paid 366 811 2,592
Identified in Profit Reserve In Stockholders' Equity 9,811 17,498 13,658
Declared (Recorded in Other Liabilities) 146 145 98
Dividends provision   4,041  
Interest on capital - credited   103 936
Total,Gross 19,597 23,667 19,201
Accrued (Recorded in Other Liabilities) (55) (15) (140)
Paid / prepaid   (122) (389)
Interest on capital, WHT (55) (122) (389)
Interest on capital, WHT   (15) (140)
Identified in Profit Reserve In Stockholders' Equity (765) (1,093) (1,114)
Total, WHT (820) (1,230) (1,643)
Accrued (Recorded in Other Liabilities) 457 233 1,737
Paid / prepaid 9,274 5,799 3,277
Dividends - 1 monthly installment paid on 01/02/2017 146 145 98
Dividends - 11 monthly installments paid from February to December 2016 1,606 1,069 1,074
Dividends provision   4,041 843
Interest on capital - paid on 08/25/2016 311 689 2,203
Interest on capital - credited   88 796
Identified in Profit Reserve In Stockholders' Equity 9,046 16,405 12,544
Total R$ 18,777 R$ 22,437 R$ 17,558