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Significant Accounting Policies - Summary of Reconciliation of Stockholders' Equity (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Jan. 01, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2017
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items]          
In accordance with IAS 39 (excluding non-controlling interests)   R$ 24,907 R$ 23,193 R$ 21,627  
In accordance with IFRS 9 - attributable to non-controlling stockholders   732 32 389  
Net income   25,639 23,225 22,016  
Other financial assets   (75,090) (59,568)   R$ (53,895)
Interest of non-controllingstockholders   R$ 13,684 12,978   R$ 12,289
Stockholders Equity [Member] | In Accordance With IAS 39 [member]          
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items]          
In accordance with IAS 39 (excluding non-controlling interests) R$ 112,252   134,840 122,582  
Adjustments arising from changes in the financial asset derecognition policy, net of tax effects 2,280   2,402 2,462  
In accordance with IAS 39 (excluding non-controlling interests) 114,532   137,242 125,044  
Expected loss (4,615)   (9,858) (7,915)  
Loan operations and Finance leases (5,189)   (8,574) (7,385)  
Other financial assets 574   (1,284) (530)  
Change in financial assets     138 36  
Adjustment to fair value of financial assets (661)   (540) (787)  
Effect of adoption of investments in Associates / Joint ventures     (116)    
Deferred taxes on the above adjustments 2,534   4,324 3,774  
Interest of non-controllingstockholders 187   188 (57)  
Total adjustments (2,555)   (5,864) (4,949)  
Stockholders Equity [Member] | IFRS9 [member]          
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items]          
In accordance with IAS 39 (excluding non-controlling interests) 111,977   131,378 120,095  
In accordance with IFRS 9 - attributable to non-controlling stockholders 1,620   12,978 12,289  
Net income R$ 113,597   144,356 132,384  
Income [member] | In Accordance With IAS 39 [member]          
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items]          
In accordance with IAS 39 (excluding non-controlling interests)     23,903 23,263  
Adjustments arising from changes in the financial asset derecognition policy, net of tax effects     (78) 201  
In accordance with IAS 39 (excluding non-controlling interests)     23,825 23,464  
Expected loss     (1,948) (3,438)  
Loan operations and Finance leases     (1,192) (2,259)  
Other financial assets     (756) (1,179)  
Change in financial assets     101 36  
Adjustment to fair value of financial assets     359 514  
Deferred taxes on the above adjustments     522 1,164  
Interest of non-controllingstockholders     334 (113)  
Total adjustments     (632) (1,837)  
Income [member] | IFRS9 [member]          
Disclosure of reconciliation of carrying amounts of financial assets and financial liabilities on the date of initial application of IFRS 9 [line items]          
In accordance with IAS 39 (excluding non-controlling interests)     23,193 21,627  
In accordance with IFRS 9 - attributable to non-controlling stockholders     32 389  
Net income     R$ 23,225 R$ 22,016