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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, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period R$ (1,498) R$ (1,029)
Amounts recognized in income (1+2+3+4) (224) (255)
1 - Cost of current service (53) (80)
2 - Cost of past service   (1)
3 - Net interest (108) (82)
4 - Other expenses (63) (92)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) 91 (410)
5 - Effects on asset ceiling 1,198 369
6 - Remeasurements (1,125) (736)
Changes in demographic assumptions 4 (11)
Changes in financial assumptions 3,821 25
Experience of the plan  (4,950) (750)
7 - Exchange variation 18 (43)
Other (8+9+10) (85) 196
8 - Receipt by Destination of Resources (4) (323)  
9 - Benefits paid 128 115
10 - Contributions and investments from sponsor 110 81
Amounts at end of the period (1,716) (1,498)
Amount recognized in Assets (Note 18a) 493 585
Amount recognized in Liabilities (Note 18b) (2,209) (2,083)
BD and CV Plans [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (1,079) (688)
Amounts recognized in income (1+2+3+4) (131) (134)
1 - Cost of current service (53) (80)
2 - Cost of past service   (1)
3 - Net interest (78) (53)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) (282) (338)
5 - Effects on asset ceiling 665 406
6 - Remeasurements (965) (701)
Changes in demographic assumptions 4 (11)
Changes in financial assumptions 3,708 13
Experience of the plan  (4,677) (703)
7 - Exchange variation 18 (43)
Other (8+9+10) 110 81
10 - Contributions and investments from sponsor 110 81
Amounts at end of the period (1,382) (1,079)
Amount recognized in Assets (Note 18a) 48 82
Amount recognized in Liabilities (Note 18b) (1,430) (1,161)
BD and CV Plans [member] | Net assets [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period 23,225 22,732
Amounts recognized in income (1+2+3+4) 1,722 1,731
2 - Cost of past service 0 0
3 - Net interest 1,722 1,731
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) (1,764) (75)
6 - Remeasurements (1,766) (113)
Experience of the plan  (1,766) (113)
7 - Exchange variation 2 38
Other (8+9+10) (1,271) (1,163)
9 - Benefits paid (1,381) (1,244)
10 - Contributions and investments from sponsor 110 81
Amounts at end of the period 21,912 23,225
BD and CV Plans [member] | Actuarial liabilities [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (20,662) (19,659)
Amounts recognized in income (1+2+3+4) (1,575) (1,578)
1 - Cost of current service (53) (80)
2 - Cost of past service   (1)
3 - Net interest (1,522) (1,497)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) 817 (669)
6 - Remeasurements 801 (588)
Changes in demographic assumptions 4 (11)
Changes in financial assumptions 3,708 13
Experience of the plan  (2,911) (590)
7 - Exchange variation 16 (81)
Other (8+9+10) 1,381 1,244
9 - Benefits paid 1,381 1,244
Amounts at end of the period (20,039) (20,662)
BD and CV Plans [member] | Asset restriction [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (3,642) (3,761)
Amounts recognized in income (1+2+3+4) (278) (287)
3 - Net interest (278) (287)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) 665 406
5 - Effects on asset ceiling 665 406
Amounts at end of the period (3,255) (3,642)
CD Plans [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period 503 626
Amounts recognized in income (1+2+3+4) (27) (45)
3 - Net interest 36 47
4 - Other expenses (63) (92)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) 292 (78)
5 - Effects on asset ceiling 533 (37)
6 - Remeasurements (241) (41)
Experience of the plan  (241) (41)
Other (8+9+10) (323)  
8 - Receipt by Destination of Resources (4) (323)  
Amounts at end of the period 445 503
Amount recognized in Assets (Note 18a) 445 503
CD Plans [member] | Net assets [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period 1,454 1,475
Amounts recognized in income (1+2+3+4) 41 20
3 - Net interest 104 112
4 - Other expenses (63) (92)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) (725) (41)
5 - Effects on asset ceiling (484)  
6 - Remeasurements (241) (41)
Experience of the plan  (241) (41)
Other (8+9+10) (323)  
8 - Receipt by Destination of Resources (4) (323)  
Amounts at end of the period 447 1,454
CD Plans [member] | Asset restriction [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (951) (849)
Amounts recognized in income (1+2+3+4) (68) (65)
3 - Net interest (68) (65)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) 1,017 (37)
5 - Effects on asset ceiling 1,017 (37)
Amounts at end of the period (2) (951)
Other post employment benefits [member]    
Disclosure of defined benefit plans [line items]    
Amounts at the beginning of the period (922) (967)
Amounts recognized in income (1+2+3+4) (66) (76)
3 - Net interest (66) (76)
Amounts recognized in stockholders´ equity - other comprehensive income (5+6+7) 81 6
6 - Remeasurements 81 6
Changes in financial assumptions 113 12
Experience of the plan  (32) (6)
Other (8+9+10) 128 115
9 - Benefits paid 128 115
Amounts at end of the period (779) (922)
Amount recognized in Liabilities (Note 18b) R$ (779) R$ (922)