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Post-Employment Benefits - Summary of Changes in Net Amount Recognized in Balance Sheet (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period R$ 34 R$ 345
Amounts recognized in income (loss) (1+2+3) (499) (33)
1 - Cost of current service (75) (69)
2 - Cost of past service (418) 0
3 - Net interest (6) 36
Amounts recognized in stockholders' equity (4+5+6) (645) (292)
4 - Effects on asset ceiling 560 (63)
5 - Remeasurements (1,222) (238)
6 - Exchange variation 17 9
Other (7+8+9+10) 27 14
8 - Benefits paid 35 19
9 - Contributions from sponsor (18) (16)
10 - Contributions from parcipants 10 11
Amounts end of the period (1,083) 34
BD and CV Plans [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (349) (120)
Amounts recognized in income (loss) (1+2+3) (100) (75)
1 - Cost of current service (75) (69)
2 - Cost of past service 0 0
3 - Net interest (25) (6)
Amounts recognized in stockholders' equity (4+5+6) (387) (234)
4 - Effects on asset ceiling 384 (126)
5 - Remeasurements (788) (117)
6 - Exchange variation 17 9
Other (7+8+9+10) 94 80
9 - Contributions from sponsor 84 69
10 - Contributions from parcipants 10 11
Amounts end of the period (742) (349)
BD and CV Plans [member] | Net assets [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period 18,808 17,588
Amounts recognized in income (loss) (1+2+3) 1,769 1,700
2 - Cost of past service 0 0
3 - Net interest 1,769 1,700
Amounts recognized in stockholders' equity (4+5+6) 3,239 580
5 - Remeasurements 3,245 566
6 - Exchange variation (6) 14
Other (7+8+9+10) (1,084) (1,060)
8 - Benefits paid (1,178) (1,140)
9 - Contributions from sponsor 84 69
10 - Contributions from parcipants 10 11
Amounts end of the period 22,732 18,808
BD and CV Plans [member] | Actuarial liabilities [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (15,493) (14,491)
Amounts recognized in income (loss) (1+2+3) (1,514) (1,454)
1 - Cost of current service (75) (69)
2 - Cost of past service 0 0
3 - Net interest (1,439) (1,385)
Amounts recognized in stockholders' equity (4+5+6) (3,884) (688)
5 - Remeasurements (3,907) (683)
6 - Exchange variation 23 (5)
Other (7+8+9+10) 1,178 1,140
8 - Benefits paid 1,178 1,140
Amounts end of the period (19,713) (15,493)
BD and CV Plans [member] | Asset restriction [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (3,664) (3,217)
Amounts recognized in income (loss) (1+2+3) (355) (321)
2 - Cost of past service 0 0
3 - Net interest (355) (321)
Amounts recognized in stockholders' equity (4+5+6) 258 (126)
4 - Effects on asset ceiling 384 (126)
5 - Remeasurements (126)  
Amounts end of the period (3,761) (3,664)
CD Plans [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period 665 722
Amounts recognized in income (loss) (1+2+3) 60 67
2 - Cost of past service 0 0
3 - Net interest 60 67
Amounts recognized in stockholders' equity (4+5+6) 3 (39)
4 - Effects on asset ceiling 176 63
5 - Remeasurements (173) (102)
Other (7+8+9+10) (102) (85)
9 - Contributions from sponsor (102) (85)
Amounts end of the period 626 665
CD Plans [member] | Net assets [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period 1,604 1,634
Amounts recognized in income (loss) (1+2+3) 151 157
2 - Cost of past service 0 0
3 - Net interest 151 157
Amounts recognized in stockholders' equity (4+5+6) (178) (102)
5 - Remeasurements (178) (102)
Other (7+8+9+10) (102) (85)
9 - Contributions from sponsor (102) (85)
Amounts end of the period 1,475 1,604
CD Plans [member] | Asset restriction [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (939) (912)
Amounts recognized in income (loss) (1+2+3) (91) (90)
2 - Cost of past service 0 0
3 - Net interest (91) (90)
Amounts recognized in stockholders' equity (4+5+6) 181 63
4 - Effects on asset ceiling 176 63
5 - Remeasurements 5  
Amounts end of the period (849) (939)
Other post employment benefits [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (282) (257)
Amounts recognized in income (loss) (1+2+3) (459) (25)
2 - Cost of past service (418) 0
3 - Net interest (41) (25)
Amounts recognized in stockholders' equity (4+5+6) (261) (19)
5 - Remeasurements (261) (19)
Other (7+8+9+10) 35 19
8 - Benefits paid 35 19
Amounts end of the period R$ (967) R$ (282)